1. Species Carex abitibiana Lepage
2. Species Carex aboriginum M.E.Jones
3. Species Carex abortiva Holmb.
4. Species Carex abrupta Mack.
5. Species Carex abscondita Mack.
   1. Variety Carex abscondita var. abscondita Mack. accepted as Carex abscondita Mack.
   2. Variety Carex abscondita var. glauca (Chapm.) Fernald accepted as Carex abscondita Mack.
   3. Variety Carex abscondita var. rostellata Fernald accepted as Carex abscondita Mack.
6. Species Carex acaulis d'Urv.
7. Species Carex accrescens Ohwi
   1. Variety Carex accrescens var. sylvipaludosa Luchnik accepted as Carex accrescens Ohwi
8. Species Carex acicularis Boott
9. Species Carex acidicola Naczi
10. Species Carex acocksii C.Archer
11. Species Carex acuta L.
    1. Forma Carex acuta f. amblylepis Peterm. accepted as Carex acuta L.
    2. Forma Carex acuta f. badia Sanio accepted as Carex nigra subsp. nigra (L.) Reichard
    3. Forma Carex acuta f. diluta Sanio accepted as Carex nigra subsp. nigra (L.) Reichard
    4. Forma Carex acuta f. fluviatilis (Hartm.) Almq. accepted as Carex acuta L.
    5. Forma Carex acuta f. graciliflora Legrand accepted as Carex acuta L.
    6. Forma Carex acuta f. gracilis (Curtis) Sanio accepted as Carex acuta L.
    7. Forma Carex acuta f. melanolepis Sanio accepted as Carex nigra subsp. nigra (L.) Reichard
    8. Forma Carex acuta f. minor Boeckeler accepted as Carex turfosa Fr.
    9. Forma Carex acuta f. pedicellata Peterm. accepted as Carex acuta L.
    10. Forma Carex acuta f. personata (Fr.) Almq. accepted as Carex acuta L.
    11. Forma Carex acuta f. prolixa (Fr.) Almq. accepted as Carex prolixa Fr.
    12. Forma Carex acuta f. pseudosparganioides Čelak. accepted as Carex nigra subsp. nigra (L.) Reichard
    13. Forma Carex acuta f. rigida Sanio accepted as Carex brunnea subsp. brunnea Thunb.
    14. Forma Carex acuta f. ripensis Laest. accepted as Carex limula Fr.
    15. Forma Carex acuta f. stygia Sanio accepted as Carex nigra subsp. nigra (L.) Reichard
    16. Forma Carex acuta f. tourangiana (Boreau) Sanio accepted as Carex acuta L.
    17. Forma Carex acuta f. touranginiana (Boreau) Sanio accepted as Carex acuta L.
    18. Forma Carex acuta f. tricostata (Fr.) Almq. accepted as Carex acuta L.
    19. Forma Carex acuta f. vaginata Peterm. accepted as Carex acuta L.
    20. Forma Carex acuta f. zygostachya Rchb. accepted as Carex acuta L.
    21. Subspecies Carex acuta subsp. angustifolia Čelak. accepted as Carex nigra subsp. nigra (L.) Reichard
    22. Subspecies Carex acuta subsp. broteriana (Samp.) Rivas Mart. accepted as Carex reuteriana subsp. reuteriana Boiss.
    23. Subspecies Carex acuta subsp. colorata F.Nyl. accepted as Carex acuta L.
    24. Subspecies Carex acuta subsp. intermedia Čelak. accepted as Carex acuta L.
    25. Subspecies Carex acuta subsp. mauritanica (Boiss. & Reut.) A.Asensi & B.Díez accepted as Carex reuteriana subsp. mauritanica (Boiss. & Reut.) Jim.Mejías & Luceño
    26. Subspecies Carex acuta subsp. nigra (L.) Ehrh. accepted as Carex nigra (L.) Reichard
    27. Subspecies Carex acuta subsp. nutans Čelak. accepted as Carex acuta L.
    28. Subspecies Carex acuta subsp. personata (Fr.) P.Fourn. accepted as Carex acuta L.
    29. Subspecies Carex acuta subsp. prolixa (Fr.) Nyman accepted as Carex prolixa Fr.
    30. Subspecies Carex acuta subsp. reuteriana (Boiss.) Rivas Mart. & J.M.Pizarro accepted as Carex reuteriana Boiss.
    31. Subspecies Carex acuta subsp. rufa (L.) Ehrh. accepted as Carex riparia Curtis
    32. Subspecies Carex acuta subsp. ruffa (L.) Ehrh. accepted as Carex acuta L.
    33. Subvariety Carex acuta subvar. graciliflora Legrand accepted as Carex acuta L.
    34. Variety Carex acuta var. amblylepis (Peterm.) Nyman accepted as Carex acuta L.
    35. Variety Carex acuta var. angustifolia Čelak. accepted as Carex nigra subsp. nigra (L.) Reichard
    36. Variety Carex acuta var. anomala Hartm. accepted as Carex acuta L.
    37. Variety Carex acuta var. appendiculata Trautv. & C.A.Mey. accepted as Carex appendiculata (Trautv. & C.A.Mey.) Kük.
    38. Variety Carex acuta var. broteriana (Samp.) Rivas Mart. accepted as Carex reuteriana Boiss.
    39. Variety Carex acuta var. chlorostachya Rchb. accepted as Carex acuta L.
    40. Variety Carex acuta var. chlorotica Čelak. accepted as Carex acuta L.
    41. Variety Carex acuta var. colorata (F.Nyl.) Nyl. & Saelán accepted as Carex acuta L.
    42. Variety Carex acuta var. dioica Peterm. accepted as Carex acuta L.
    43. Variety Carex acuta var. elegans Wimm. accepted as Carex elytroides Fr.
    44. Variety Carex acuta var. erecta Dewey accepted as Carex angustata Boott
    45. Variety Carex acuta var. fluviatilis Hartm. accepted as Carex acuta L.
    46. Variety Carex acuta var. graciliflora (Legrand) Rouy accepted as Carex acuta L.
    47. Variety Carex acuta var. integrirostris Regel accepted as Carex acuta L.
    48. Variety Carex acuta var. intermedia Čelak. accepted as Carex acuta L.
    49. Variety Carex acuta var. longiglumis Cariot accepted as Carex brunnea subsp. brunnea Thunb.
    50. Variety Carex acuta var. macrocarpa Čelak. accepted as Carex nigra subsp. nigra (L.) Reichard
    51. Variety Carex acuta var. major Gray accepted as Carex acuta L.
    52. Variety Carex acuta var. minor Boeckeler accepted as Carex limula Fr.
    53. Variety Carex acuta var. minor Sw. accepted as Carex nigra subsp. nigra (L.) Reichard
    54. Variety Carex acuta var. minor Trevir. accepted as Carex acuta L.
    55. Variety Carex acuta var. moenchiana Nyman accepted as Carex acuta L.
    56. Variety Carex acuta var. monstrosa Gray accepted as Carex acuta L.
    57. Variety Carex acuta var. nardifolia Hartm. accepted as Carex acuta L.
    58. Variety Carex acuta var. nervosa G.Mey. accepted as Carex trinervis Degl.
    59. Variety Carex acuta var. nigra L. accepted as Carex nigra (L.) Reichard
    60. Variety Carex acuta var. nutans Čelak. accepted as Carex acuta L.
    61. Variety Carex acuta var. oxylepis Sanio accepted as Carex nigra subsp. nigra (L.) Reichard
    62. Variety Carex acuta var. pallida Boott accepted as Carex kelloggii var. kelloggii W.Boott
    63. Variety Carex acuta var. panormitana (Guss.) Nyman accepted as Carex panormitana Guss.
    64. Variety Carex acuta var. personata Fr. accepted as Carex acuta L.
    65. Variety Carex acuta var. polystachia Lej. accepted as Carex acuta L.
    66. Variety Carex acuta var. prolixa (Fr.) Almq. accepted as Carex prolixa Fr.
    67. Variety Carex acuta var. pseudaquatilis Appel accepted as Carex brunnea subsp. brunnea Thunb.
    68. Variety Carex acuta var. reuteriana (Boiss.) S.Rivas Martinez & J.Pizarro accepted as Carex reuteriana Boiss.
    69. Variety Carex acuta var. rufa L. accepted as Carex riparia Curtis
    70. Variety Carex acuta var. ruffa L. accepted as Carex acuta L.
    71. Variety Carex acuta var. sennenii Pau ex Sennen accepted as Carex riparia Curtis
    72. Variety Carex acuta var. sparganioides Čelak. accepted as Carex elytroides Fr.
    73. Variety Carex acuta var. sparsiflora Dewey accepted as Carex acuta L.
    74. Variety Carex acuta var. sphaerocarpa R.Uechtr. accepted as Carex acuta L.
    75. Variety Carex acuta var. staminifera Boott accepted as Carex brunnea subsp. brunnea Thunb.
    76. Variety Carex acuta var. stenophylla Rouy accepted as Carex acuta L.
    77. Variety Carex acuta var. touranginiana (Boreau) Rouy accepted as Carex acuta L.
    78. Variety Carex acuta var. tricostata (Fr.) Crép. accepted as Carex acuta L.
    79. Variety Carex acuta var. trinervis (Degl.) Jess. accepted as Carex trinervis Degl.
    80. Variety Carex acuta var. turfosa Sanio accepted as Carex nigra subsp. nigra (L.) Reichard
    81. Variety Carex acuta var. amblylepis Peterm. (uncertain > unassessed)
12. Species Carex acutata Boott
    1. Variety Carex acutata var. acutata Boott accepted as Carex acutata Boott
    2. Variety Carex acutata var. ciliata Kük. accepted as Carex acutata Boott
    3. Variety Carex acutata var. hirtisquama Kük. accepted as Carex niederleiniana Boeckeler
    4. Variety Carex acutata var. multispicata (Kunze) Kük. accepted as Carex multispicata Kunze
    5. Variety Carex acutata var. niederleinia Kük. accepted as Carex niederleiniana Boeckeler
    6. Variety Carex acutata var. niederleiniana (Boeckeler) Kük. accepted as Carex niederleiniana Boeckeler
13. Species Carex acutiformis Ehrh.
    1. Forma Carex acutiformis f. depauperata (Lange) Kük. accepted as Carex acutiformis Ehrh.
    2. Forma Carex acutiformis f. gracilior Kük. accepted as Carex acutiformis Ehrh.
    3. Forma Carex acutiformis f. maxima (Urb.) Kük. accepted as Carex acutiformis Ehrh.
    4. Forma Carex acutiformis f. minor Peterm. accepted as Carex acutiformis Ehrh.
    5. Forma Carex acutiformis f. spadicea (Nyman) Asch. & Graebn. accepted as Carex acutiformis Ehrh.
    6. Forma Carex acutiformis f. spadicea (Hartm.) Neuman accepted as Carex acutiformis Ehrh.
    7. Subspecies Carex acutiformis subsp. kochiana (DC.) K.Richt. accepted as Carex acutiformis Ehrh.
    8. Variety Carex acutiformis var. abbreviata Beck accepted as Carex acutiformis Ehrh.
    9. Variety Carex acutiformis var. kochiana (DC.) Garcke accepted as Carex acutiformis Ehrh.
    10. Variety Carex acutiformis var. spadicea (Hartm.) Asch. & Graebn. accepted as Carex acutiformis Ehrh.
14. Species Carex adelostoma V.I.Krecz.
15. Species Carex adrienii E.G.Camus
16. Species Carex adulterina Chenevard
17. Species Carex adusta Boott
    1. Variety Carex adusta var. argyrantha L.H.Bailey accepted as Carex siccata var. siccata Dewey
    2. Variety Carex adusta var. congesta W.Boott accepted as Carex specifica L.H.Bailey
    3. Variety Carex adusta var. glomerata L.H.Bailey accepted as Carex adusta Boott
    4. Variety Carex adusta var. minor Boott accepted as Carex petasata Dewey
    5. Variety Carex adusta var. sparsiflora L.H.Bailey accepted as Carex siccata var. siccata Dewey
18. Species Carex aematorrhyncha Desv.
    1. Variety Carex aematorrhyncha var. aematorhyncha Desv.
    2. Variety Carex aematorrhyncha var. aematorrhyncha Desv.
    3. Variety Carex aematorrhyncha var. corralensis (Phil.) Kük.
19. Species Carex aequialta Kük.
20. Species Carex aestivaliformis Mack.
21. Species Carex aestivalis M.A.Curtis ex A.Gray
22. Species Carex aethiopica Schkuhr
    1. Variety Carex aethiopica var. iridifolia (Kunth) C.B.Clarke accepted as Carex aethiopica Schkuhr
    2. Variety Carex aethiopica var. latispica C.B.Clarke accepted as Carex clavata Thunb.
    3. Variety Carex aethiopica var. stolonifera Boeckeler accepted as Carex petitiana subsp. petitiana A.Rich.
23. Species Carex agastachys L.f.
24. Species Carex agglomerata C.B.Clarke
25. Species Carex aggregata Mack.
26. Species Carex akitaensis Fujiw.
27. Species Carex akiyamana Ohwi
28. Species Carex alajica Litv.
29. Species Carex alascana Boeckeler
30. Species Carex alata Torr.
    1. Variety Carex alata var. ferruginea (A.Gray) Fernald accepted as Carex albolutescens Schwein.
    2. Variety Carex alata var. pulchra Olney accepted as Carex alata Torr.
31. Species Carex alatauensis S.R.Zhang
32. Species Carex alba Scop.
    1. Forma Carex alba f. aprica Kük. accepted as Carex alba Scop.
    2. Subspecies Carex alba subsp. ussuriensis (Kom.) Kük. accepted as Carex ussuriensis Kom.
    3. Variety Carex alba var. setifolia Dewey accepted as Carex eburnea Boott
    4. Variety Carex alba var. ussuriensis (Kom.) T.Koyama accepted as Carex ussuriensis Kom.
33. Species Carex alberti H.Lév.
34. Species Carex albert-smithii T.Koyama
35. Species Carex albicans Willd. ex Spreng.
    1. Variety Carex albicans var. albicans Willd. ex Spreng.
    2. Variety Carex albicans var. australis (L.H.Bailey) Rettig
    3. Variety Carex albicans var. emmonsii (Dewey ex Torr.) Rettig
36. Species Carex albidibasis T.Koyama
37. Species Carex albolutescens Schwein.
    1. Variety Carex albolutescens var. alata (Torr.) Kük. accepted as Carex alata Torr.
    2. Variety Carex albolutescens var. argyrantha (L.H.Bailey) Olney ex L.H.Bailey accepted as Carex siccata var. siccata Dewey
    3. Variety Carex albolutescens var. brunnea Olney ex A.Gray accepted as Carex albolutescens Schwein.
    4. Variety Carex albolutescens var. cumulata (L.H.Bailey) L.H.Bailey accepted as Carex cumulata (L.H.Bailey) Mack.
    5. Variety Carex albolutescens var. ferruginea (A.Gray) Kük. accepted as Carex albolutescens Schwein.
    6. Variety Carex albolutescens var. glomerata Olney ex L.H.Bailey accepted as Carex adusta Boott
    7. Variety Carex albolutescens var. meridionalis Kük. accepted as Carex meridionalis (Kük.) Herter
    8. Variety Carex albolutescens var. sparsiflora Olney ex A.Gray accepted as Carex albolutescens Schwein.
38. Species Carex albonigra Mack.
39. Species Carex alboviridis C.B.Clarke
40. Species Carex albula Allan
41. Species Carex albursina E.Sheld.
42. Species Carex algida Turcz. ex V.I.Krecz.
43. Species Carex allanii Hamlin
44. Species Carex alligata Boott
    1. Variety Carex alligata var. degeneri R.W.Krauss accepted as Carex alligata Boott
45. Species Carex alliiformis C.B.Clarke
46. Species Carex allivescens V.I.Krecz.
47. Species Carex allolepis Rchb.
48. Species Carex alluvialis Figert
49. Species Carex alma L.H.Bailey
50. Species Carex almii Holmb.
51. Species Carex alopecoidea Tuck.
    1. Variety Carex alopecoidea var. sparsispicata Dewey accepted as Carex alopecoidea Tuck.
    2. Forma Carex alopecoidea f. sparsispicata Kük. (uncertain > unassessed)
    3. Forma Carex alopecoidea f. sparsispicata (Dewey) Kük. (uncertain > unassessed)
52. Species Carex alopecuroides D.Don
    1. Subspecies Carex alopecuroides subsp. subtransversa (C.B.Clarke) T.Koyama accepted as Carex subtransversa C.B.Clarke
    2. Variety Carex alopecuroides var. chlorostachya C.B.Clarke accepted as Carex doniana Spreng.
    3. Variety Carex alopecuroides var. chlorostachys C.B.Clarke accepted as Carex doniana Spreng.
53. Species Carex alopecuroides D.Don ex Tilloch & Taylor
54. Species Carex alsatica Zahn
    1. Subspecies Carex alsatica subsp. subviridula (Fernald) Govaerts accepted as Carex subviridula Fernald
55. Species Carex alsophila F.Muell.
56. Species Carex alta Boott
    1. Variety Carex alta var. brevior H.Lév. & Vaniot accepted as Carex gibba Wahlenb.
    2. Variety Carex alta var. gymnocarpa H.Lév. & Vaniot accepted as Carex rochebrunei subsp. rochebrunei Franch. & Sav.
    3. Variety Carex alta var. latialata Kük. accepted as Carex alta Boott
    4. Variety Carex alta var. rochebrunei (Franch. & Sav.) Franch. accepted as Carex rochebrunei Franch. & Sav.
57. Species Carex altaica (Gorodkov) V.I.Krecz.
58. Species Carex alterniflora Franch.
    1. Variety Carex alterniflora var. alterniflora Franch.
    2. Variety Carex alterniflora var. aureobrunnea Ohwi
    3. Variety Carex alterniflora var. elongatula Ohwi
    4. Variety Carex alterniflora var. fulva Ohwi
    5. Variety Carex alterniflora var. rubrovaginata J.Oda & Nagam.
    6. Variety Carex alterniflora var. arimaensis Ohwi accepted as Carex arimaensis (Ohwi) T.Hoshino
    7. Variety Carex alterniflora var. pseudostrigosa (H.Lév. & Vaniot) Akiyama accepted as Carex alterniflora var. alterniflora Franch.
    8. Variety Carex alterniflora var. tenuinervis (Ohwi) Ohwi accepted as Carex tenuinervis Ohwi
59. Species Carex amgunensis F.Schmidt
    1. Variety Carex amgunensis var. chloroleuca (Meinsh.) Kük. accepted as Carex amgunensis F.Schmidt
60. Species Carex amicta Boott
61. Species Carex amphibola Steud.
    1. Variety Carex amphibola var. amphibola Steud. accepted as Carex amphibola Steud.
    2. Variety Carex amphibola var. globosa (L.H.Bailey) L.H.Bailey accepted as Carex bulbostylis Mack.
    3. Variety Carex amphibola var. godfreyi (Naczi) D.B.Ward accepted as Carex godfreyi Naczi
    4. Variety Carex amphibola var. rigida (L.H.Bailey) Fernald accepted as Carex planispicata Naczi
    5. Variety Carex amphibola var. turgida Fernald accepted as Carex grisea Wahlenb.
62. Species Carex amplectens Mack.
63. Species Carex amplifolia Boott
64. Species Carex anbouensis Katsuy.
65. Species Carex andersonii Boott
66. Species Carex andina Phil.
    1. Variety Carex andina var. andina Phil. accepted as Carex andina Phil.
    2. Variety Carex andina var. subabscondita Kük. accepted as Carex andina Phil.
67. Species Carex andringitrensis Cherm.
68. Species Carex angolensis Nelmes
69. Species Carex angusta (C.B.Clarke) Sameer Patil
70. Species Carex angustata Boott
    1. Variety Carex angustata var. strictior Dudley accepted as Carex angustata Boott
    2. Variety Carex angustata var. verticillata Boott accepted as Carex interrupta Boeckeler
71. Species Carex angustilepis Reznicek & S.González
72. Species Carex angustinowiczii Meinsh. ex Korsh.
73. Species Carex angustispica Reznicek & S.González
74. Species Carex angustisquama Franch.
75. Species Carex angustiutricula F.T.Wang & Tang ex L.K.Dai
76. Species Carex aniaiensis Fujiw. & Y.Matsuda
77. Species Carex anisoneura V.I.Krecz.
78. Species Carex anisostachys Liebm.
    1. Variety Carex anisostachys var. chlorocarpos (Liebm.) L.H.Bailey accepted as Carex anisostachys Liebm.
    2. Variety Carex anisostachys var. monticola Kük. accepted as Carex anisostachys Liebm.
79. Species Carex annectens (E.P.Bicknell) E.P.Bicknell
    1. Variety Carex annectens var. ambigua (Barratt) Gleason accepted as Carex annectens (E.P.Bicknell) E.P.Bicknell
    2. Variety Carex annectens var. annectens (E.P.Bicknell) E.P.Bicknell accepted as Carex annectens (E.P.Bicknell) E.P.Bicknell
    3. Variety Carex annectens var. xanthocarpa (Kük.) Wiegand accepted as Carex annectens (E.P.Bicknell) E.P.Bicknell
80. Species Carex anomoea Hand.-Mazz.
81. Species Carex anthoxanthea J.Presl & C.Presl
    1. Variety Carex anthoxanthea var. leiocarpa (C.A.Mey.) Kük. accepted as Carex anthoxanthea J.Presl & C.Presl
82. Species Carex antoniensis A.Chev.
83. Species Carex aperta Boott
    1. Forma Carex aperta f. concinnula Holm accepted as Carex aperta Boott
    2. Forma Carex aperta f. hydroessa Holm accepted as Carex aperta Boott
    3. Forma Carex aperta f. mimetica Holm accepted as Carex aperta Boott
    4. Variety Carex aperta var. angustifolia Boott accepted as Carex nudata W.Boott
    5. Variety Carex aperta var. divaricata L.H.Bailey accepted as Carex aquatilis var. aquatilis Wahlenb.
    6. Variety Carex aperta var. umbrosa Kük. accepted as Carex aperta Boott
    7. Variety Carex aperta var. viridans Kük. accepted as Carex aperta Boott
84. Species Carex aphanolepis Franch. & Sav.
85. Species Carex aphylla Kunth
86. Species Carex aphyllopus Kük.
    1. Variety Carex aphyllopus var. aphyllopus Kük.
    2. Variety Carex aphyllopus var. impura (Ohwi) T.Koyama
    3. Variety Carex aphyllopus var. aristata Ohwi accepted as Carex otayae Ohwi
    4. Variety Carex aphyllopus var. paludicola Ohwi accepted as Carex aphyllopus var. aphyllopus Kük.
87. Species Carex apoiensis Akiyama
88. Species Carex appalachica J.M.Webber & P.W.Ball
89. Species Carex appendiculata (Trautv. & C.A.Mey.) Kük.
    1. Variety Carex appendiculata var. appendiculata (Trautv. & C.A.Mey.) Kük. accepted as Carex appendiculata (Trautv. & C.A.Mey.) Kük.
    2. Variety Carex appendiculata var. sacculiformis Y.L.Chang & Y.L.Yang accepted as Carex humbertiana Ohwi
90. Species Carex applanata Thorsen & de Lange
91. Species Carex appressa R.Br.
    1. Variety Carex appressa var. appressa R.Br.
    2. Forma Carex appressa f. diaphana (Boott) Kük. accepted as Carex appressa var. appressa R.Br.
    3. Forma Carex appressa f. minor Kük. accepted as Carex appressa R.Br.
    4. Variety Carex appressa var. diaphana (Boott) Kük. accepted as Carex appressa R.Br.
    5. Variety Carex appressa var. elatior Nees accepted as Carex tereticaulis F.Muell.
    6. Variety Carex appressa var. secta (Boott) Kük. accepted as Carex secta Boott
    7. Variety Carex appressa var. sectoides Kük. accepted as Carex sectoides (Kük.) Edgar
    8. Variety Carex appressa var. typica Domin accepted as Carex appressa R.Br.
    9. Variety Carex appressa var. virgata (Sol. ex Boott) Kük. accepted as Carex appressa R.Br.
    10. Forma Carex appressa f. appressa R.Br. (uncertain > unassessed)
92. Species Carex appropinquata Schumach.
93. Species Carex aquatilis Wahlenb.
    1. Variety Carex aquatilis var. aquatilis Wahlenb.
    2. Variety Carex aquatilis var. dives (Holm) Kük.
    3. Variety Carex aquatilis var. minor Boott
    4. Variety Carex aquatilis var. substricta Kük.
    5. Forma Carex aquatilis f. angustata Kük. accepted as Carex aquatilis var. dives (Holm) Kük.
    6. Forma Carex aquatilis f. cuspidata Laest. ex Andersson accepted as Carex aquatilis var. aquatilis Wahlenb.
    7. Forma Carex aquatilis f. epigaea Kurtz accepted as Carex aquatilis var. aquatilis Wahlenb.
    8. Forma Carex aquatilis f. laxa Kük. accepted as Carex aquatilis var. aquatilis Wahlenb.
    9. Forma Carex aquatilis f. sciaphila (Holm) Kük. accepted as Carex aquatilis var. aquatilis Wahlenb.
    10. Forma Carex aquatilis f. sphagnophila (Fr.) Almq. accepted as Carex aquatilis var. aquatilis Wahlenb.
    11. Forma Carex aquatilis f. virescens Andersson accepted as Carex aquatilis var. aquatilis Wahlenb.
    12. Subspecies Carex aquatilis subsp. altior (Rydb.) Hultén accepted as Carex emoryi Dewey
    13. Subspecies Carex aquatilis subsp. anguillata (Drejer) K.Richt. accepted as Carex dacica Heuff.
    14. Subspecies Carex aquatilis subsp. aquatilis Wahlenb. accepted as Carex aquatilis Wahlenb.
    15. Subspecies Carex aquatilis subsp. arcuata K.Richt. accepted as Carex aquatilis var. aquatilis Wahlenb.
    16. Subspecies Carex aquatilis subsp. epigeios (Fr.) Nyman accepted as Carex salina Wahlenb.
    17. Subspecies Carex aquatilis subsp. epigejos (Laest.) Nyman accepted as Carex salina var. salina Wahlenb.
    18. Subspecies Carex aquatilis subsp. hyperborea (Drejer) K.Richt. accepted as Carex dacica Heuff.
    19. Subspecies Carex aquatilis subsp. nardifolia (Wahlenb.) K.Richt. accepted as Carex subspathacea Wormsk. ex Hornem.
    20. Subspecies Carex aquatilis subsp. stans (Drejer) Hultén accepted as Carex aquatilis var. minor Boott
    21. Variety Carex aquatilis var. acutangula (F.Nyl.) Nyl. & Saelán accepted as Carex halophila var. halophila F.Nyl.
    22. Variety Carex aquatilis var. affinis (F.Nyl.) Nyl. & Saelán accepted as Carex halophila var. halophila F.Nyl.
    23. Variety Carex aquatilis var. altior (Rydb.) Fernald accepted as Carex emoryi Dewey
    24. Variety Carex aquatilis var. anguillata (Drejer) Nyman accepted as Carex dacica Heuff.
    25. Variety Carex aquatilis var. cuspidata Fr. accepted as Carex aquatilis var. aquatilis Wahlenb.
    26. Variety Carex aquatilis var. elatior Bab. accepted as Carex aquatilis var. aquatilis Wahlenb.
    27. Variety Carex aquatilis var. epigejos Laest. accepted as Carex salina var. salina Wahlenb.
    28. Variety Carex aquatilis var. epigeois (Fr.) Laest. accepted as Carex salina Wahlenb.
    29. Variety Carex aquatilis var. flavicans F.Nyl. accepted as Carex flavicans (F.Nyl.) F.Nyl.
    30. Variety Carex aquatilis var. genuina Syme accepted as Carex aquatilis Wahlenb.
    31. Variety Carex aquatilis var. nardifolia Wahlenb. accepted as Carex subspathacea Wormsk. ex Hornem.
    32. Variety Carex aquatilis var. pachystoma (Holm) Kük. accepted as Carex aquatilis var. dives (Holm) Kük.
    33. Variety Carex aquatilis var. planifolia F.Nyl. accepted as Carex aquatilis var. aquatilis Wahlenb.
    34. Variety Carex aquatilis var. plumbeophila Kelso accepted as Carex aquatilis var. aquatilis Wahlenb.
    35. Variety Carex aquatilis var. pulchella Behm accepted as Carex aquatilis Wahlenb.
    36. Variety Carex aquatilis var. rhomboidea (Holm) Kelso accepted as Carex aquatilis var. aquatilis Wahlenb.
    37. Variety Carex aquatilis var. rigida A.Benn. accepted as Carex aquatilis var. aquatilis Wahlenb.
    38. Variety Carex aquatilis var. salina (Wahlenb.) Fr. accepted as Carex salina Wahlenb.
    39. Variety Carex aquatilis var. sciaphila (Holm) Kelso accepted as Carex aquatilis var. aquatilis Wahlenb.
    40. Variety Carex aquatilis var. sitchensis (J.D.Prescott ex Bong.) Kelso accepted as Carex aquatilis var. dives (Holm) Kük.
    41. Variety Carex aquatilis var. sphagnophila Fr. accepted as Carex aquatilis var. aquatilis Wahlenb.
    42. Variety Carex aquatilis var. stans (Drejer) Boott accepted as Carex aquatilis var. minor Boott
    43. Variety Carex aquatilis var. watsonii Syme accepted as Carex aquatilis var. aquatilis Wahlenb.
94. Species Carex arakanei T.Koyama
95. Species Carex arakiana (Ohwi) Ohwi
96. Species Carex arapahoensis Clokey
97. Species Carex arcatica Meinsh.
    1. Forma Carex arcatica f. taldycola Ovcz. & Czukav. accepted as Carex orbicularis Boott
    2. Variety Carex arcatica var. pedunculata Meinsh. accepted as Carex arcatica Meinsh.
98. Species Carex archeri Boott
99. Species Carex arcta Boott
    1. Variety Carex arcta var. oregana (L.H.Bailey) B.Boivin accepted as Carex arcta Boott
100. Species Carex arctata Boott
     1. Variety Carex arctata var. faxonii L.H.Bailey accepted as Carex arctata Boott
101. Species Carex arctiformis Mack.
102. Species Carex arctogena Harry Sm.
103. Species Carex arctophila F.Nyl.
     1. Subspecies Carex arctophila subsp. subreducta (Lepage) ined.
104. Species Carex arenaria L.
     1. Forma Carex arenaria f. pallida Lackow. accepted as Carex arenaria L.
     2. Forma Carex arenaria f. pumila Lackow. accepted as Carex arenaria L.
     3. Forma Carex arenaria f. remota (T.Marsson) Almq. accepted as Carex arenaria L.
     4. Subspecies Carex arenaria subsp. colchica (J.Gay) Nyman accepted as Carex colchica J.Gay
     5. Subspecies Carex arenaria subsp. ligerica (J.Gay) Bonnier & Layens accepted as Carex colchica J.Gay
     6. Subspecies Carex arenaria subsp. repens (Bellardi) Wahlenb. accepted as Carex repens Bellardi
     7. Variety Carex arenaria var. adjunta Merino accepted as Carex arenaria L.
     8. Variety Carex arenaria var. castanea Boott accepted as Carex colchica J.Gay
     9. Variety Carex arenaria var. colchica (J.Gay) Christ accepted as Carex colchica J.Gay
     10. Variety Carex arenaria var. posnaniensis (Sprib.) Asch. & Graebn. accepted as Carex repens Bellardi
     11. Variety Carex arenaria var. prostrata De Langhe accepted as Carex arenaria L.
     12. Variety Carex arenaria var. pseudoarenaria T.Marsson accepted as Carex arenaria L.
     13. Variety Carex arenaria var. pseudobrizoides (Clavaud) Nyman accepted as Carex pseudobrizoides Clavaud
     14. Variety Carex arenaria var. remota T.Marsson accepted as Carex arenaria L.
     15. Variety Carex arenaria var. repens (Bellardi) Wahlenb. accepted as Carex repens Bellardi
     16. Variety Carex arenaria var. spiralis Asch. & Graebn. accepted as Carex arenaria L.
     17. Variety Carex arenaria var. tenuis Asch. & Graebn. accepted as Carex arenaria L.
     18. Variety Carex arenaria var. umbrosa Coss. & Germ. accepted as Carex pseudobrizoides Clavaud
     19. Variety Carex arenaria var. umbrosa (Sprib.) Sprib. accepted as Carex repens Bellardi
105. Species Carex arenicola F.Schmidt
     1. Subspecies Carex arenicola subsp. pansa (L.H.Bailey) T.Koyama & Calder accepted as Carex pansa L.H.Bailey
106. Species Carex argentina Barros
107. Species Carex argunensis Turcz. ex Trevir.
     1. Subspecies Carex argunensis subsp. alticola (Popl. ex Sukaczev) Malyschev accepted as Carex argunensis Turcz. ex Trevir.
108. Species Carex argyi H.Lév. & Vaniot
109. Species Carex argyrantha Tuck. ex Boott
110. Species Carex argyrolepis Maxim. ex Franch. & Sav.
111. Species Carex aridula V.I.Krecz.
112. Species Carex arimaensis (Ohwi) T.Hoshino
113. Species Carex arisanensis Hayata
     1. Subspecies Carex arisanensis subsp. arisanensis Hayata
     2. Subspecies Carex arisanensis subsp. ruianensis H.Wang, C.Song & X.F.Jin
     3. Variety Carex arisanensis var. tremula Ohwi accepted as Carex filipes var. tremula (Ohwi) Ohwi
114. Species Carex aristatisquamata Tang & F.T.Wang ex L.K.Dai
115. Species Carex aristulifera P.C.Li
116. Species Carex arizonica Licher, G.Rink & Reznicek
117. Species Carex arkansana (L.H.Bailey) L.H.Bailey
118. Species Carex arnellii Christ ex Scheutz
     1. Variety Carex arnellii var. hondoensis (Ohwi) T.Koyama accepted as Carex hondoensis Ohwi
119. Species Carex arnottiana Nees ex Drejer
120. Species Carex arsenei Kük.
121. Species Carex arthuriana C.L.Beckm. & Figert
122. Species Carex aschersonii H.Lév.
123. Species Carex ascotreta C.B.Clarke ex Franch.
124. Species Carex aspericaulis (G.A.Wheeler) J.R.Starr
125. Species Carex asperifructus Kük.
126. Species Carex asraoi D.M.Verma
127. Species Carex assiniboinensis W.Boott
     1. Forma Carex assiniboinensis f. ambulans J.-P.Bernard accepted as Carex assiniboinensis W.Boott
     2. Forma Carex assiniboinensis f. assiniboinensis W.Boott accepted as Carex assiniboinensis W.Boott
128. Species Carex astricta K.A.Ford
129. Species Carex asturica Boiss.
130. Species Carex asynchrona Naczi
131. Species Carex aterrima Hoppe
     1. Subspecies Carex aterrima subsp. aterrima Hoppe
     2. Subspecies Carex aterrima subsp. medwedewii (Leskov) T.V.Egorova
     3. Variety Carex aterrima var. wolfii Kneuck. accepted as Carex aterrima subsp. aterrima Hoppe
132. Species Carex atherodes Spreng.
     1. Forma Carex atherodes f. glabra (R.Uechtr.) Lepage accepted as Carex atherodes Spreng.
     2. Forma Carex atherodes f. imberbis (A.Gray) B.Boivin accepted as Carex atherodes Spreng.
     3. Variety Carex atherodes var. cujavica (Asch. & Sprib.) Rauschert accepted as Carex atherodes Spreng.
     4. Variety Carex atherodes var. glabra (R.Uechtr.) Rauschert accepted as Carex atherodes Spreng.
     5. Variety Carex atherodes var. kirschsteinii (Asch. & Graebn.) Rauschert accepted as Carex atherodes Spreng.
     6. Variety Carex atherodes var. longo-lanceolata (Dewey) Gilly accepted as Carex atherodes Spreng.
     7. Variety Carex atherodes var. maxima (Kük.) A.E.Kozhevn. accepted as Carex atherodes Spreng.
     8. Variety Carex atherodes var. orthostachys (C.A.Mey.) A.E.Kozhevn. accepted as Carex atherodes Spreng.
     9. Variety Carex atherodes var. siegertiana (Uechtr.) Rauschert accepted as Carex atherodes Spreng.
     10. Variety Carex atherodes var. vix-vaginans (Kük.) A.E.Kozhevn. accepted as Carex atherodes Spreng.
133. Species Carex athrostachya Olney
     1. Variety Carex athrostachya var. unilateralis (Mack.) B.Boivin accepted as Carex unilateralis Mack.
134. Species Carex atlantica L.H.Bailey
     1. Subspecies Carex atlantica subsp. atlantica L.H.Bailey
     2. Subspecies Carex atlantica subsp. capillacea (L.H.Bailey) Reznicek
     3. Variety Carex atlantica var. atlantica L.H.Bailey accepted as Carex atlantica L.H.Bailey
     4. Variety Carex atlantica var. capillacea (L.H.Bailey) Cronquist accepted as Carex atlantica subsp. capillacea (L.H.Bailey) Reznicek
     5. Variety Carex atlantica var. incomperta (E.P.Bicknell) F.J.Herm. accepted as Carex atlantica subsp. atlantica L.H.Bailey
135. Species Carex atlasica (H.Lindb.) Tattou
136. Species Carex atractodes F.J.Herm.
137. Species Carex atrata L.
     1. Subspecies Carex atrata subsp. atrata L.
     2. Subspecies Carex atrata subsp. longistolonifera (Kük.) S.Yun Liang
     3. Subspecies Carex atrata subsp. pullata (Boott) Kük.
     4. Forma Carex atrata f. aterrima (Hoppe) Neuman accepted as Carex aterrima Hoppe
     5. Forma Carex atrata f. caeca (L.H.Bailey) Kük. accepted as Carex heteroneura var. heteroneura S.Watson
     6. Forma Carex atrata f. castanea (Nyman) K.Richt. accepted as Carex atrata subsp. atrata L.
     7. Forma Carex atrata f. decolorans Neuman accepted as Carex atrata subsp. atrata L.
     8. Forma Carex atrata f. gelida Schur accepted as Carex atrata subsp. atrata L.
     9. Forma Carex atrata f. lenis (L.H.Bailey) Kük. accepted as Carex heteroneura var. heteroneura S.Watson
     10. Forma Carex atrata f. parviflora (Host) Neuman accepted as Carex parviflora Host
     11. Forma Carex atrata f. wolfii (Kneuck.) Kük. accepted as Carex aterrima subsp. aterrima Hoppe
     12. Subforma Carex atrata subforma aristata Podp. accepted as Carex atrata subsp. atrata L.
     13. Subspecies Carex atrata subsp. apodostachya (Ohwi) T.Koyama accepted as Carex atrata subsp. atrata L.
     14. Subspecies Carex atrata subsp. aterrima (Hoppe) Hartm. accepted as Carex aterrima Hoppe
     15. Subspecies Carex atrata subsp. atratiformis Kük. accepted as Carex atratiformis Britton
     16. Subspecies Carex atrata subsp. atrosquama (Mack.) Hultén accepted as Carex atrosquama Mack.
     17. Subspecies Carex atrata subsp. bicolor Čelak. accepted as Carex atrata subsp. atrata L.
     18. Subspecies Carex atrata subsp. castanea (Nyman) K.Richt. accepted as Carex atrata subsp. atrata L.
     19. Subspecies Carex atrata subsp. caucasica (Steven) Kük. accepted as Carex caucasica Steven
     20. Subspecies Carex atrata subsp. magellanica (Lam.) Wahlenb. accepted as Carex magellanica Lam.
     21. Subspecies Carex atrata subsp. nigra (Gaudin) Hartm. accepted as Carex parviflora Host
     22. Subspecies Carex atrata subsp. perfusca (V.I.Krecz.) T.Koyama accepted as Carex aterrima subsp. aterrima Hoppe
     23. Variety Carex atrata var. aterrima (Hoppe) Winckler accepted as Carex aterrima Hoppe
     24. Variety Carex atrata var. atrata L. accepted as Carex atrata L.
     25. Variety Carex atrata var. atrosquama (Mack.) Cronquist accepted as Carex atrosquama Mack.
     26. Variety Carex atrata var. bicolor Čelak. accepted as Carex atrata subsp. atrata L.
     27. Variety Carex atrata var. brunnescens Andersson accepted as Carex atrata subsp. atrata L.
     28. Variety Carex atrata var. castanea Nyman accepted as Carex atrata subsp. atrata L.
     29. Variety Carex atrata var. caucasica (Steven) Boott accepted as Carex caucasica Steven
     30. Variety Carex atrata var. chalciolepis (Holm) Kük. accepted as Carex chalciolepis Holm
     31. Variety Carex atrata var. conglomerata Neilr. accepted as Carex parviflora Host
     32. Variety Carex atrata var. discolor L.H.Bailey accepted as Carex bella L.H.Bailey
     33. Variety Carex atrata var. dubia Gaudin accepted as Carex atrata subsp. atrata L.
     34. Variety Carex atrata var. erecta W.Boott accepted as Carex heteroneura var. heteroneura S.Watson
     35. Variety Carex atrata var. glacialis Boott accepted as Carex atrata subsp. pullata (Boott) Kük.
     36. Variety Carex atrata var. heterostachya Almq. accepted as Carex atrata subsp. atrata L.
     37. Variety Carex atrata var. japonoalpina T.Koyama accepted as Carex atrata subsp. atrata L.
     38. Variety Carex atrata var. larimerana (Kelso) Kelso accepted as Carex chalciolepis Holm
     39. Variety Carex atrata var. laxa Neilr. accepted as Carex atrata subsp. atrata L.
     40. Variety Carex atrata var. longistolonifera Kük. accepted as Carex atrata subsp. longistolonifera (Kük.) S.Yun Liang
     41. Variety Carex atrata var. magellanica (Lam.) Wahlenb. accepted as Carex magellanica Lam.
     42. Variety Carex atrata var. nigra Olney accepted as Carex nova L.H.Bailey
     43. Variety Carex atrata var. nigra Gaudin accepted as Carex parviflora Host
     44. Variety Carex atrata var. nigra (All.) W.Boott accepted as Carex helleri Mack.
     45. Variety Carex atrata var. ovata Boott accepted as Carex atrata subsp. atrata L.
     46. Variety Carex atrata var. parviflora (Host) Beck accepted as Carex parviflora Host
     47. Variety Carex atrata var. pseudocilicica Kük. accepted as Carex atrata subsp. atrata L.
     48. Variety Carex atrata var. pullata Boott accepted as Carex atrata subsp. pullata (Boott) Kük.
     49. Variety Carex atrata var. rectiuscula Hartm. accepted as Carex atrata subsp. atrata L.
     50. Variety Carex atrata var. sinensis Kük. accepted as Carex atrata subsp. pullata (Boott) Kük.
     51. Variety Carex atrata var. spadicea Beurl. accepted as Carex atrata subsp. atrata L.
     52. Variety Carex atrata var. spiculosior Norman accepted as Carex atrata subsp. atrata L.
     53. Variety Carex atrata var. subgracilenta Kük. accepted as Carex atrata subsp. pullata (Boott) Kük.
     54. Variety Carex atrata var. typica Beck accepted as Carex atrata L.
     55. Variety Carex atrata var. varia Gaudin accepted as Carex atrata L.
     56. Subspecies Carex atrata subsp. aterrima (Hoppe) Čelak (uncertain > unassessed)
     57. Subspecies Carex atrata subsp. aterrima (Hoppe) S.Yun Liang (uncertain > unassessed)
     58. Variety Carex atrata var. nigra Boott (uncertain > unassessed)
138. Species Carex atratiformis Britton
     1. Subspecies Carex atratiformis subsp. atratiformis Britton accepted as Carex atratiformis Britton
     2. Subspecies Carex atratiformis subsp. raymondii (Calder) A.E.Porsild accepted as Carex atratiformis Britton
139. Species Carex atrivaginata Nelmes
140. Species Carex atrofusca Schkuhr
     1. Subspecies Carex atrofusca subsp. atrofusca Schkuhr
     2. Subspecies Carex atrofusca subsp. minor (Boott) T.Koyama
     3. Forma Carex atrofusca f. atrofusca Schkuhr accepted as Carex atrofusca Schkuhr
     4. Forma Carex atrofusca f. decolorata (A.E.Porsild) B.Boivin accepted as Carex atrofusca subsp. atrofusca Schkuhr
     5. Forma Carex atrofusca f. flavescens Kük. accepted as Carex atrofusca subsp. atrofusca Schkuhr
     6. Subspecies Carex atrofusca subsp. coriophora (Fisch. & C.A.Mey. ex Kunth) Printz accepted as Carex coriophora Fisch. & C.A.Mey. ex Kunth
     7. Variety Carex atrofusca var. angustifructus Kük. accepted as Carex atrofusca subsp. minor (Boott) T.Koyama
     8. Variety Carex atrofusca var. coriophora (Fisch. & C.A.Mey. ex Kunth) Kük. accepted as Carex coriophora Fisch. & C.A.Mey. ex Kunth
     9. Variety Carex atrofusca var. decolorata A.E.Porsild accepted as Carex atrofusca subsp. atrofusca Schkuhr
     10. Variety Carex atrofusca var. fulvicoma Kom. accepted as Carex krascheninnikovii Kom. ex V.I.Krecz.
     11. Variety Carex atrofusca var. fusca Krylov accepted as Carex coriophora subsp. coriophora Fisch. & C.A.Mey. ex Kunth
     12. Variety Carex atrofusca var. major (Boeckeler) Raymond accepted as Carex coriophora subsp. coriophora Fisch. & C.A.Mey. ex Kunth
     13. Variety Carex atrofusca var. minor (Boott) Kük. accepted as Carex atrofusca subsp. minor (Boott) T.Koyama
     14. Variety Carex atrofusca var. nortoniana B.Boivin accepted as Carex atrofusca subsp. atrofusca Schkuhr
141. Species Carex atrofuscoides K.T.Fu
142. Species Carex atropicta Steud.
     1. Forma Carex atropicta f. atropicta Steud. accepted as Carex atropicta Steud.
     2. Forma Carex atropicta f. monodynama Kük. accepted as Carex monodynama (Griseb.) G.A.Wheeler
     3. Forma Carex atropicta f. pallescens (Kurtz ex Kük.) Kük. accepted as Carex monodynama (Griseb.) G.A.Wheeler
     4. Variety Carex atropicta var. monodynama Griseb. accepted as Carex monodynama (Griseb.) G.A.Wheeler
     5. Variety Carex atropicta var. pallescens Kurtz ex Kük. accepted as Carex monodynama (Griseb.) G.A.Wheeler
     6. Variety Carex atropicta var. platycarpa Phil. ex Kük. accepted as Carex malmei Kalela
143. Species Carex atrosquama Mack.
144. Species Carex auceps (de Lange & Heenan) K.A.Ford
145. Species Carex aucklandica (Hamlin) K.A.Ford
146. Species Carex augustinowiczii Meinsh.
     1. Variety Carex augustinowiczii var. augustinowiczii Meinsh.
     2. Variety Carex augustinowiczii var. sharensis (Franch.) Ohwi
     3. Subspecies Carex augustinowiczii subsp. soyaeensis (Kük.) T.V.Egorova accepted as Carex augustinowiczii var. augustinowiczii Meinsh.
     4. Variety Carex augustinowiczii var. macrogyna Ohwi accepted as Carex augustinowiczii var. augustinowiczii Meinsh.
147. Species Carex aurea Nutt.
     1. Forma Carex aurea f. colorata Farw. accepted as Carex aurea Nutt.
     2. Variety Carex aurea var. androgyna Olney accepted as Carex garberi Fernald
     3. Variety Carex aurea var. celsa L.H.Bailey accepted as Carex hassei L.H.Bailey
148. Species Carex aureolensis Steud.
149. Species Carex auriculata Franch.
150. Species Carex auroniensis L.C.Lamb.
151. Species Carex austrina Mack.
152. Species Carex austroalpina Bech.
153. Species Carex austroamericana G.A.Wheeler
154. Species Carex austrocaroliniana L.H.Bailey
155. Species Carex austrocompacta K.L.Wilson
156. Species Carex austrodeflexa P.D.McMillan, Sorrie & van Eerden
157. Species Carex austrojacutensis Schekhovts.
158. Species Carex austrolucorum (Rettig) D.B.Poind. & Naczi
159. Species Carex austromexicana Reznicek
160. Species Carex austro-occidentalis F.T.Wang & Tang ex Y.C.Tang
161. Species Carex austrosinensis Tang & F.T.Wang ex S.Y.Liang
162. Species Carex austrosulcata K.L.Wilson
163. Species Carex austrotenella K.L.Wilson
164. Species Carex austrozhejiangensis C.Z.Zheng & X.F.Jin
165. Species Carex autumnalis Ohwi
166. Species Carex ayako-maedae T.Koyama
167. Species Carex aztecica Mack.
168. Species Carex baccans Nees
     1. Forma Carex baccans f. aurantiaca Kuntze accepted as Carex baccans Nees
     2. Forma Carex baccans f. nigra Kuntze accepted as Carex baccans Nees
     3. Forma Carex baccans f. normalis Kuntze accepted as Carex baccans Nees
     4. Forma Carex baccans f. recurvirostris Kuntze accepted as Carex baccans Nees
     5. Variety Carex baccans var. siccifructus C.B.Clarke accepted as Carex baccans Nees
169. Species Carex backii Boott
     1. Variety Carex backii var. backii Boott accepted as Carex backii Boott
     2. Variety Carex backii var. saximontana (Mack.) B.Boivin accepted as Carex saximontana Mack.
     3. Variety Carex backii var. subrostrata (Bates) Dorn accepted as Carex saximontana Mack.
170. Species Carex badilloi Luceño & Márq.-Corro
171. Species Carex baileyi Britton
172. Species Carex baimaensis S.W.Su
173. Species Carex baiposhanensis P.C.Li
174. Species Carex bajacalifornica Zika
175. Species Carex bakkeriana D.T.E.Ploeg & Rudolphy
176. Species Carex balansae Franch.
177. Species Carex baldensis L.
178. Species Carex balfourii Kük.
179. Species Carex baltzellii Chapm.
180. Species Carex bamaensis X.F.Jin & W.Jie Chen
181. Species Carex bambusetorum Merr.
182. Species Carex banksiana K.A.Ford
183. Species Carex banksii Boott
     1. Variety Carex banksii var. abbreviata Kük.
     2. Variety Carex banksii var. banksii Boott
     3. Variety Carex banksii var. fonkii (Phil.) Kük.
     4. Variety Carex banksii var. odontolepis (Phil.) Kük.
     5. Forma Carex banksii f. brevifolia Kük. accepted as Carex banksii var. banksii Boott
     6. Forma Carex banksii f. ochrostachys (Phil.) Kük. accepted as Carex banksii var. banksii Boott
     7. Forma Carex banksii f. pallescens Kük. accepted as Carex banksii var. banksii Boott
     8. Variety Carex banksii var. cilliesii (Phil.) Kük. accepted as Carex banksii var. banksii Boott
     9. Variety Carex banksii var. distans Kük. accepted as Carex banksii var. banksii Boott
     10. Variety Carex banksii var. gilliesii (Phil.) Kük. accepted as Carex banksii var. banksii Boott
184. Species Carex baohuashanica Tang & F.T.Wang ex L.K.Dai
185. Species Carex barbarae Dewey
186. Species Carex barbata Boott
187. Species Carex barbayaki Jim.Mejías & Roalson
188. Species Carex baronii Baker
189. Species Carex barrattii Torr. ex Schwein.
190. Species Carex basiantha Steud.
191. Species Carex basiflora C.B.Clarke
192. Species Carex basutorum (Turrill) Luceño & Martín-Bravo
193. Species Carex bathiei H.Lév.
194. Species Carex bavicola Raymond
195. Species Carex bebbii (L.H.Bailey) Olney ex Fernald
196. Species Carex beckii G.A.Wheeler
197. Species Carex beckmanniana Figert
198. Species Carex beckmannii Keck
199. Species Carex bella L.H.Bailey
200. Species Carex bengyana H.Lév. & L.C.Lamb.
201. Species Carex benkei Tak.Shimizu
202. Species Carex bequaertii De Wild.
     1. Subspecies Carex bequaertii subsp. bequaertii De Wild.
     2. Subspecies Carex bequaertii subsp. mossii (Nelmes) Míguez, Martín-Bravo & Jim.-Mejías
     3. Variety Carex bequaertii var. maxima Lye accepted as Carex bequaertii subsp. bequaertii De Wild.
     4. Subspecies Carex bequaertii subsp. mossii (Nelmes) Miguez, Martin-Bravo & Jim.Mejias (uncertain > unassessed)
203. Species Carex bermudiana Hemsl.
204. Species Carex berteroniana Steud.
205. Species Carex bhutanensis S.R.Zhang
206. Species Carex bichenoviana Boott
207. Species Carex bicknellii Britton & A.Br.
208. Species Carex bicolor Bellardi ex All.
     1. Variety Carex bicolor var. androgyna (Olney) S.L.Welsh accepted as Carex garberi Fernald
     2. Variety Carex bicolor var. bicolor Bellardi ex All. accepted as Carex bicolor Bellardi ex All.
     3. Variety Carex bicolor var. minima (Boullu) Nyman accepted as Carex bicolor Bellardi ex All.
209. Species Carex biegensis Cherm.
210. Species Carex bigelowii Torr. ex Schwein.
     1. Subspecies Carex bigelowii subsp. arctisibirica (Jurtzev) Á.Löve & D.Löve
     2. Subspecies Carex bigelowii subsp. bigelowii Torr. ex Schwein.
     3. Subspecies Carex bigelowii subsp. ensifolia (Turcz. ex Gorodkov) Holub
     4. Subspecies Carex bigelowii subsp. lugens (Holm) T.V.Egorova
     5. Forma Carex bigelowii f. anguillata (Drejer) Fernald accepted as Carex dacica Heuff.
     6. Forma Carex bigelowii f. bigelowii Torr. ex Schwein. accepted as Carex bigelowii Torr. ex Schwein.
     7. Forma Carex bigelowii f. glacialis (Fr.) Raymond accepted as Carex dacica Heuff.
     8. Subspecies Carex bigelowii subsp. altaica (Gorodkov) Malyschev accepted as Carex altaica (Gorodkov) V.I.Krecz.
     9. Subspecies Carex bigelowii subsp. dacica (Heuff.) T.V.Egorova accepted as Carex dacica Heuff.
     10. Subspecies Carex bigelowii subsp. ensifolia Holub accepted as Carex ensifolia Turcz. ex Ledeb.
     11. Subspecies Carex bigelowii subsp. hyperborea (Drejer) Böcher accepted as Carex dacica Heuff.
     12. Subspecies Carex bigelowii subsp. hyperborea Bocher accepted as Carex bigelowii Torr. ex Schwein.
     13. Subspecies Carex bigelowii subsp. nardeticola Holub accepted as Carex dacica Heuff.
     14. Subspecies Carex bigelowii subsp. paishanensis (Nakai) Vorosch. accepted as Carex atrata subsp. atrata L.
     15. Subspecies Carex bigelowii subsp. rigida (Raf.) W.Schultze-Motel accepted as Carex dacica Heuff.
     16. Subspecies Carex bigelowii subsp. rigidioides (Gorodkov) T.V.Egorova accepted as Carex rigidioides (Gorodkov) V.I.Krecz.
     17. Variety Carex bigelowii var. arctisibirica (Jurtzev) Malyschev accepted as Carex bigelowii subsp. arctisibirica (Jurtzev) Á.Löve & D.Löve
211. Species Carex biharica Simonk.
212. Species Carex bijiangensis S.Yun Liang & S.R.Zhang
213. Species Carex bilateralis Hayata
214. Species Carex billingsii (O.W.Knight) Kirschb.
215. Species Carex biltmoreana Mack.
216. Species Carex binderi Podp.
217. Species Carex binervis Sm.
     1. Forma Carex binervis f. nigrescens Druce accepted as Carex binervis Sm.
     2. Variety Carex binervis var. alpina Drejer accepted as Carex binervis Sm.
     3. Variety Carex binervis var. ovata Merino accepted as Carex binervis Sm.
     4. Variety Carex binervis var. tingitana Maire accepted as Carex paulo-vargasii Luceño & Marín
218. Species Carex bistaminata (W.Z.Di & M.J.Zhong) S.R.Zhang
219. Species Carex bitchuensis T.Hoshino & H.Ikeda
220. Species Carex biwensis Franch.
     1. Subspecies Carex biwensis subsp. jankowskii (Gorodkov) T.V.Egorova accepted as Carex jankowskii Gorodkov
221. Species Carex blakei Nelmes
222. Species Carex blanda Dewey
     1. Variety Carex blanda var. varians (L.H.Bailey) Burnham accepted as Carex leptonervia (Fernald) Fernald
223. Species Carex blepharicarpa Franch.
     1. Variety Carex blepharicarpa var. blepharicarpa Franch.
     2. Forma Carex blepharicarpa f. dueensis (Meinsh.) T.Koyama accepted as Carex blepharicarpa Franch.
     3. Variety Carex blepharicarpa var. dueensis (Meinsh.) Akiyama accepted as Carex blepharicarpa Franch.
     4. Variety Carex blepharicarpa var. hirtifructus (Kük.) Ohwi accepted as Carex hirtifructus Kük.
     5. Variety Carex blepharicarpa var. insularis Nakai accepted as Carex blepharicarpa Franch.
     6. Variety Carex blepharicarpa var. stenocarpa Ohwi accepted as Carex hirtifructus Kük.
224. Species Carex blinii H.Lév. & Vaniot
     1. Subspecies Carex blinii subsp. blinii H.Lév. & Vaniot accepted as Carex blinii H.Lév. & Vaniot
     2. Subspecies Carex blinii subsp. shanghaiensis (S.X.Qian & Y.Q.Liu) S.Yun Liang & T.Koyama accepted as Carex blinii H.Lév. & Vaniot
225. Species Carex bodinieri Franch.
226. Species Carex boecheriana Á.Löve, D.Löve & Raymond
227. Species Carex boelckeiana Barros
228. Species Carex boenninghausiana Weihe
     1. Variety Carex boenninghausiana var. subpaniculata Lange accepted as Carex paniculata L.
     2. Variety Carex boenninghausiana var. subpaniculata Lange accepted as Carex paniculata subsp. paniculata L.
229. Species Carex bogstadensis Kük.
230. Species Carex bohemica Schreb.
     1. Forma Carex bohemica f. aggregata (Domin) Soó accepted as Carex bohemica Schreb.
231. Species Carex bolanderi Olney
     1. Variety Carex bolanderi var. artemisiana Kelso accepted as Carex bolanderi Olney
     2. Variety Carex bolanderi var. elongata Olney ex A.Gray accepted as Carex bolanderi Olney
     3. Variety Carex bolanderi var. minor Olney ex A.Gray accepted as Carex bolanderi Olney
     4. Variety Carex bolanderi var. sparsiflora Olney accepted as Carex laeviculmis Meinsh.
232. Species Carex bolina O.Lang
233. Species Carex boliviensis Van Heurck & Müll.Arg.
     1. Subspecies Carex boliviensis subsp. boliviensis Van Heurck & Müll.Arg.
     2. Subspecies Carex boliviensis subsp. occidentalis Reznicek & S.González
234. Species Carex bolusii C.B.Clarke
235. Species Carex bonanzensis Britton
236. Species Carex bonariensis Desf. ex Poir.
     1. Forma Carex bonariensis f. pumila Osten accepted as Carex bonariensis var. bonariensis Desf. ex Poir.
     2. Forma Carex bonariensis f. remota (Kük.) Kük. accepted as Carex bonariensis var. bonariensis Desf. ex Poir.
     3. Variety Carex bonariensis var. achalensis Kurtz ex Kük. accepted as Carex feddeana H.Pfeiff.
     4. Variety Carex bonariensis var. bonariensis Desf. ex Poir. accepted as Carex bonariensis Desf. ex Poir. (unaccepted > junior objective synonym)
     5. Variety Carex bonariensis var. glabrescens Kurtz ex Kük. accepted as Carex pedicularis Jim.Mejías & Naczi
     6. Variety Carex bonariensis var. remota Kük. accepted as Carex bonariensis var. bonariensis Desf. ex Poir.
     7. Variety Carex bonariensis var. rupicola Pedersen accepted as Carex rupicola (Pedersen) G.A.Wheeler
     8. Variety Carex bonariensis var. tolimensis Maury accepted as Carex bonariensis var. bonariensis Desf. ex Poir.
     9. Variety Carex bonariensis var. trachycystis (Griseb.) Kük. accepted as Carex bonariensis var. bonariensis Desf. ex Poir.
237. Species Carex bonatiana (Kük.) N.A.Ivanova
238. Species Carex bonplandii Kunth
     1. Variety Carex bonplandii var. angustifolia W.Boott accepted as Carex illota L.H.Bailey
     2. Variety Carex bonplandii var. angustifolia Boott accepted as Carex bonplandii Kunth
     3. Variety Carex bonplandii var. humilior Kük. accepted as Carex bonplandii Kunth
     4. Variety Carex bonplandii var. minor Boott accepted as Carex illota L.H.Bailey
     5. Variety Carex bonplandii var. robustior Kük. accepted as Carex bonplandii Kunth
239. Species Carex borbonica Lam.
     1. Variety Carex borbonica var. pallidior Kük. accepted as Carex borbonica Lam.
240. Species Carex borealifujianica Y.F.Lu & X.F.Jin
241. Species Carex borealihinganica Y.L.Chang & Y.L.Yang
242. Species Carex borealipolaris S.R.Zhang
243. Species Carex borii Nelmes
     1. Forma Carex borii f. lutea R.R.Stewart accepted as Carex borii Nelmes
244. Species Carex boryana Schkuhr
     1. Variety Carex boryana var. minor Boott accepted as Carex boryana Schkuhr
     2. Variety Carex boryana var. rigidifolia Boeckeler accepted as Carex borbonica Lam.
     3. Variety Carex boryana var. simplicissima Kük. accepted as Carex mannii subsp. mannii E.A.Bruce
245. Species Carex bosoensis Yashiro
246. Species Carex bostrychostigma Maxim.
247. Species Carex brachyanthera Ohwi
248. Species Carex brachycalama Griseb.
249. Species Carex brachystachys Schrank
     1. Variety Carex brachystachys var. refracta Fiori accepted as Carex austroalpina Bech.
250. Species Carex bracteosa (Kunze ex Rchb.) Kunth
251. Species Carex bradei Gross
252. Species Carex brainerdii Mack.
253. Species Carex brandisii (C.B.Clarke ex Jana & R.C.Srivast.) O.Yano
254. Species Carex brasiliensis A.St.-Hil.
     1. Forma Carex brasiliensis f. robusta C.B.Clarke ex Kük. accepted as Carex brasiliensis A.St.-Hil.
     2. Variety Carex brasiliensis var. gracilis Boeckeler accepted as Carex glaucescens Elliott
255. Species Carex brehmeri Boeckeler
256. Species Carex breviaristata K.T.Fu
257. Species Carex brevicaulis Thouars
258. Species Carex brevicollis DC.
259. Species Carex breviculmis R.Br.
     1. Variety Carex breviculmis var. breviculmis R.Br.
     2. Variety Carex breviculmis var. montivaga (S.T.Blake) Noot.
     3. Variety Carex breviculmis var. perciliata Kük.
     4. Forma Carex breviculmis f. aphanandra (Franch. & Sav.) Kük. accepted as Carex leucochlora var. aphanandra (Franch. & Sav.) T.Koyama
     5. Forma Carex breviculmis f. discoidea (Boott) Kük. accepted as Carex discoidea Boott
     6. Forma Carex breviculmis f. fibrillosa (Franch. & Sav.) Kük. accepted as Carex fibrillosa Franch. & Sav.
     7. Forma Carex breviculmis f. filiculmis (Franch. & Sav.) Kük. accepted as Carex mitrata var. aristata Ohwi
     8. Forma Carex breviculmis f. longearistata Kük. accepted as Carex mitrata var. aristata Ohwi
     9. Forma Carex breviculmis f. longiaristata Kük. accepted as Carex breviculmis R.Br.
     10. Forma Carex breviculmis f. wardiana (H.Lév. & Vaniot) Kük. accepted as Carex microtricha Franch.
     11. Subspecies Carex breviculmis subsp. fibrillosa (Franch. & Sav.) T.Koyama accepted as Carex fibrillosa Franch. & Sav.
     12. Subspecies Carex breviculmis subsp. royleana (Nees) Kük. accepted as Carex leucochlora var. leucochlora Bunge
     13. Variety Carex breviculmis var. cupulifera (Hayata) Y.C.Tang & S.Yun Liang accepted as Carex orthostemon Hayata
     14. Variety Carex breviculmis var. discoidea (Boott) Boott accepted as Carex discoidea Boott
     15. Variety Carex breviculmis var. fibrillosa (Franch. & Sav.) Matsum. & Hayata accepted as Carex fibrillosa Franch. & Sav.
     16. Variety Carex breviculmis var. kingiana (H.Lév. & Vaniot) Kük. accepted as Carex mitrata var. mitrata Franch.
     17. Variety Carex breviculmis var. leucochlora (Bunge) Makino accepted as Carex leucochlora Bunge
     18. Variety Carex breviculmis var. pluricostata Kük. accepted as Carex fibrillosa Franch. & Sav.
     19. Variety Carex breviculmis var. puberula (Boott) Makino accepted as Carex leucochlora var. gracillima (Akiyama) Katsuy.
     20. Variety Carex breviculmis var. stipitata Kük. accepted as Carex breviculmis var. breviculmis R.Br.
     21. Variety Carex breviculmis var. typica Domin accepted as Carex breviculmis R.Br.
     22. Subspecies Carex breviculmis subsp. breviculmis R.Br. (uncertain > unassessed)
260. Species Carex brevicuspis C.B.Clarke
     1. Variety Carex brevicuspis var. basiflora (C.B.Clarke) Kük. accepted as Carex basiflora C.B.Clarke
     2. Variety Carex brevicuspis var. brevicuspis C.B.Clarke accepted as Carex brevicuspis C.B.Clarke
261. Species Carex brevihispida X.F.Jin & Y.F.Lu
262. Species Carex brevior (Dewey) Mack. ex Lunell
     1. Variety Carex brevior var. crawei (Boott) B.Boivin accepted as Carex bicknellii Britton & A.Br.
     2. Variety Carex brevior var. molesta (Mack.) F.C.Gates accepted as Carex molesta Mack.
     3. Variety Carex brevior var. pseudofestucacea Farw. accepted as Carex merritt-fernaldii Mack.
     4. Variety Carex brevior var. molesta (Mack. ex Bright) F.C.Gates (uncertain > unassessed)
263. Species Carex breviprophylla O.Yano
264. Species Carex breviscapa C.B.Clarke
265. Species Carex brevispicula G.H.Nam & G.Y.Chung
266. Species Carex breweri Boott
     1. Variety Carex breweri var. breweri Boott accepted as Carex breweri Boott
     2. Variety Carex breweri var. paddoensis (Suksd.) Cronquist accepted as Carex engelmannii L.H.Bailey
267. Species Carex brizoides L.
     1. Subspecies Carex brizoides subsp. brunnea Čelak. accepted as Carex praecox Schreb.
     2. Subspecies Carex brizoides subsp. curvata (Knaf) Čelak. accepted as Carex curvata Knaf
     3. Subspecies Carex brizoides subsp. ohmuelleriana (O.Lang) Nyman accepted as Carex ohmuelleriana O.Lang
268. Species Carex bromoides Willd.
     1. Subspecies Carex bromoides subsp. bromoides Willd.
     2. Subspecies Carex bromoides subsp. montana Naczi
269. Species Carex brongniartii Kunth
270. Species Carex brownii Tuck.
     1. Subspecies Carex brownii subsp. brownii Tuck.
     2. Subspecies Carex brownii subsp. transversa (Boott) J.Kern accepted as Carex transversa Boott
     3. Variety Carex brownii var. dissociata (Franch. & Sav.) T.Koyama accepted as Carex transversa Boott
     4. Variety Carex brownii var. transversa (Boott) Kük. accepted as Carex transversa Boott
271. Species Carex brunnea Thunb.
     1. Subspecies Carex brunnea subsp. brunnea Thunb.
     2. Subspecies Carex brunnea subsp. occidentalis Lye
     3. Variety Carex brunnea var. arabica S.S.Hooper
     4. Forma Carex brunnea f. simplex Kük. accepted as Carex lenta D.Don
     5. Variety Carex brunnea var. abscondita T.Koyama accepted as Carex brunnea subsp. brunnea Thunb.
     6. Variety Carex brunnea var. masoalensis (Cherm.) Cherm. accepted as Carex brunnea subsp. brunnea Thunb.
     7. Variety Carex brunnea var. meyenii (Nees) Kük. accepted as Carex meyenii Nees
     8. Variety Carex brunnea var. minor (Boott) Kük. accepted as Carex acuta L.
     9. Variety Carex brunnea var. nakiri Ohwi accepted as Carex lenta D.Don
     10. Variety Carex brunnea var. scabrifolia Boeckeler accepted as Carex brunnea subsp. brunnea Thunb.
     11. Variety Carex brunnea var. sendaica (Franch.) Kük. accepted as Carex sendaica Franch.
     12. Variety Carex brunnea var. stipitinux (C.B.Clarke ex Franch.) Kük. accepted as Carex stipitinux C.B.Clarke ex Franch.
     13. Variety Carex brunnea var. subteinogyna Kük. accepted as Carex brunnea Thunb.
272. Species Carex brunnescens (Pers.) Poir.
     1. Subspecies Carex brunnescens subsp. brunnescens (Pers.) Poir.
     2. Subspecies Carex brunnescens subsp. sphaerostachya (Tuck.) Kalela
     3. Subspecies Carex brunnescens subsp. alaskana Kalela accepted as Carex brunnescens subsp. brunnescens (Pers.) Poir.
     4. Subspecies Carex brunnescens subsp. pacifica Kalela accepted as Carex brunnescens subsp. brunnescens (Pers.) Poir.
     5. Subspecies Carex brunnescens subsp. vitilis (Fr.) Kalela accepted as Carex brunnescens subsp. brunnescens (Pers.) Poir.
     6. Variety Carex brunnescens var. brunnescens (Pers.) Poir. accepted as Carex brunnescens (Pers.) Poir.
     7. Variety Carex brunnescens var. gracilior Britton accepted as Carex brunnescens subsp. sphaerostachya (Tuck.) Kalela
     8. Variety Carex brunnescens var. laetior (F.Nyl.) Holmb. accepted as Carex brunnescens subsp. brunnescens (Pers.) Poir.
     9. Variety Carex brunnescens var. sphaerostachya (Tuck.) Kük. accepted as Carex brunnescens subsp. sphaerostachya (Tuck.) Kalela
     10. Variety Carex brunnescens var. vitilis (Fr.) Asch. & Graebn. accepted as Carex brunnescens subsp. brunnescens (Pers.) Poir.
273. Species Carex brunnipes Reznicek
274. Species Carex brysonii Naczi
275. Species Carex buchananii Berggr.
276. Species Carex bucharica Kük.
277. Species Carex buekii Wimm.
     1. Variety Carex buekii var. melanostachya R.Uechtr. accepted as Carex vratislaviensis Figert
278. Species Carex bulbostylis Mack.
279. Species Carex bullata Willd.
     1. Subspecies Carex bullata subsp. laevirostris (Blytt ex Fr.) Fr. accepted as Carex utriculata Boott
     2. Variety Carex bullata var. cylindracea Dewey accepted as Carex tuckermanii Boott
     3. Variety Carex bullata var. greenii (Boeckeler) Fernald accepted as Carex bullata Willd.
     4. Variety Carex bullata var. laevirostris Blytt ex Fr. accepted as Carex utriculata Boott
     5. Variety Carex bullata var. olneyi (Boott) Fernald accepted as Carex olneyi Boott
280. Species Carex burangensis (Y.C.Yang) S.R.Zhang
281. Species Carex burchelliana Boeckeler
282. Species Carex burkei (C.B.Clarke) Luceño & Martín-Bravo
283. Species Carex burttii Noltie
284. Species Carex bushii Mack.
285. Species Carex buxbaumii Wahlenb.
     1. Forma Carex buxbaumii f. buxbaumii Wahlenb. accepted as Carex buxbaumii Wahlenb.
     2. Forma Carex buxbaumii f. dilutior Kük. accepted as Carex buxbaumii Wahlenb.
     3. Forma Carex buxbaumii f. heterostachya Andersson accepted as Carex hartmaniorum A.Cajander
     4. Forma Carex buxbaumii f. macrostachya (Hartm.) Kük. accepted as Carex hartmaniorum A.Cajander
     5. Forma Carex buxbaumii f. mitis Norman accepted as Carex buxbaumii Wahlenb.
     6. Forma Carex buxbaumii f. oenipontana Grembl. ex Appel accepted as Carex buxbaumii Wahlenb.
     7. Forma Carex buxbaumii f. pedunculata Raymond accepted as Carex buxbaumii Wahlenb.
     8. Forma Carex buxbaumii f. virescens Norman accepted as Carex buxbaumii Wahlenb.
     9. Subspecies Carex buxbaumii subsp. alpina (Hartm.) Liro accepted as Carex adelostoma V.I.Krecz.
     10. Subspecies Carex buxbaumii subsp. hartmanii (Cajander) Domin accepted as Carex buxbaumii subsp. hartmaniorum (A.Cajander) Domin (orthographic variant)
     11. Subspecies Carex buxbaumii subsp. hartmaniorum (A.Cajander) Domin accepted as Carex hartmaniorum A.Cajander
     12. Subspecies Carex buxbaumii subsp. mutica (Hartm.) Isov. accepted as Carex adelostoma V.I.Krecz.
     13. Subspecies Carex buxbaumii subsp. subulata (Cajander) Liro accepted as Carex buxbaumii Wahlenb.
     14. Variety Carex buxbaumii var. alpicola Hartm. accepted as Carex adelostoma V.I.Krecz.
     15. Variety Carex buxbaumii var. alpina Hartm. accepted as Carex adelostoma V.I.Krecz.
     16. Variety Carex buxbaumii var. anticostensis Raymond accepted as Carex buxbaumii Wahlenb.
     17. Variety Carex buxbaumii var. australis Andersson accepted as Carex hartmaniorum A.Cajander
     18. Variety Carex buxbaumii var. claviformis Russow accepted as Carex buxbaumii Wahlenb.
     19. Variety Carex buxbaumii var. cylindrica Russow accepted as Carex hartmaniorum A.Cajander
     20. Variety Carex buxbaumii var. cylindrostachya Beurl. accepted as Carex hartmaniorum A.Cajander
     21. Variety Carex buxbaumii var. macrostachya Hartm. accepted as Carex hartmaniorum A.Cajander
     22. Variety Carex buxbaumii var. mutica Hartm. accepted as Carex adelostoma V.I.Krecz.
     23. Variety Carex buxbaumii var. sibirica Litv. accepted as Carex buxbaumii Wahlenb.
     24. Variety Carex buxbaumii var. submutica Hartm. accepted as Carex buxbaumii Wahlenb.
     25. Variety Carex buxbaumii var. subrigida Neuman accepted as Carex buxbaumii Wahlenb.
     26. Variety Carex buxbaumii var. heterostachya Andersson (uncertain > unassessed)
286. Species Carex cabralii Reznicek & S.González
287. Species Carex caduca Boott
     1. Variety Carex caduca var. ortegae (Phil.) Kük. accepted as Carex caduca Boott
288. Species Carex caeligena Reznicek
289. Species Carex caesariensis Mack.
290. Species Carex caespititia Nees
291. Species Carex calcicola Tang & F.T.Wang
292. Species Carex calcifugens Naczi
293. Species Carex calcis K.A.Ford
294. Species Carex californica L.H.Bailey
295. Species Carex callista Nelmes
296. Species Carex callitrichos V.I.Krecz.
     1. Variety Carex callitrichos var. callitrichos V.I.Krecz.
     2. Variety Carex callitrichos var. nana (H.Lév. & Vaniot) S.Yun Liang, L.K.Dai & Y.C.Tang
     3. Variety Carex callitrichos var. austrohinganica Y.L.Chang & Y.L.Yang accepted as Carex humilis var. humilis Leyss.
297. Species Carex cambodiensis Nelmes
298. Species Carex camposii Boiss. & Reut.
     1. Subspecies Carex camposii subsp. camposii Boiss. & Reut.
     2. Subspecies Carex camposii subsp. tejedensis R.Sánchez-Villegas, M.Escudero & Luceño
299. Species Carex camptoglochin V.I.Krecz.
300. Species Carex canariensis Kük.
301. Species Carex candriani Kneuck.
302. Species Carex canescens L.
     1. Subspecies Carex canescens subsp. canescens L.
     2. Subspecies Carex canescens subsp. disjuncta (Fernald) Toivonen
     3. Variety Carex canescens var. robustior Blytt ex Andersson
     4. Forma Carex canescens f. fulvescens Holmb. accepted as Carex canescens L.
     5. Forma Carex canescens f. subsubulosa (Norman) Toivonen accepted as Carex canescens subsp. canescens L.
     6. Subspecies Carex canescens subsp. arctiformis (Mack.) Calder & Roy L.Taylor accepted as Carex arctiformis Mack.
     7. Subspecies Carex canescens subsp. brunnescens (Pers.) Asch. & Graebn. accepted as Carex brunnescens (Pers.) Poir.
     8. Subspecies Carex canescens subsp. lapponica (O.Lang) Hiitonen accepted as Carex lapponica O.Lang
     9. Subspecies Carex canescens subsp. macilenta (F.Nyl.) K.Richt. accepted as Carex macilenta F.Nyl.
     10. Subspecies Carex canescens subsp. persoonii (O.Lang) K.Richt. accepted as Carex canescens subsp. canescens L.
     11. Subspecies Carex canescens subsp. subloliacea (Laest.) K.Richt. accepted as Carex lapponica O.Lang
     12. Subspecies Carex canescens subsp. vitilis (Fr.) K.Richt. accepted as Carex brunnescens subsp. brunnescens (Pers.) Poir.
     13. Variety Carex canescens var. alpicola Wahlenb. accepted as Carex brunnescens subsp. brunnescens (Pers.) Poir.
     14. Variety Carex canescens var. alpicola Kurtz accepted as Carex canescens var. robustior Blytt ex Andersson
     15. Variety Carex canescens var. bracteata Klett & Richt. accepted as Carex canescens subsp. canescens L.
     16. Variety Carex canescens var. brunnea Macoun accepted as Carex canescens subsp. canescens L.
     17. Variety Carex canescens var. brunnescens (Pers.) W.D.J.Koch accepted as Carex brunnescens (Pers.) Poir.
     18. Variety Carex canescens var. canescens L. accepted as Carex canescens L.
     19. Variety Carex canescens var. congesta Domin accepted as Carex canescens subsp. canescens L.
     20. Variety Carex canescens var. curta (Gooden.) Macloskie accepted as Carex curta Gooden.
     21. Variety Carex canescens var. disjuncta Fernald accepted as Carex canescens subsp. disjuncta (Fernald) Toivonen
     22. Variety Carex canescens var. dubia L.H.Bailey accepted as Carex praeceptorum Mack.
     23. Variety Carex canescens var. dubia Kük. accepted as Carex canescens var. robustior Blytt ex Andersson
     24. Variety Carex canescens var. fallax Kurtz ex Kük. accepted as Carex canescens var. robustior Blytt ex Andersson
     25. Variety Carex canescens var. fallax Kurtz accepted as Carex canescens L.
     26. Variety Carex canescens var. gracillima Schur accepted as Carex canescens subsp. canescens L.
     27. Variety Carex canescens var. heterostachya Farw. accepted as Carex canescens subsp. canescens L.
     28. Variety Carex canescens var. laetevirens Asch. accepted as Carex canescens subsp. canescens L.
     29. Variety Carex canescens var. lapponica (O.Lang) Nyman accepted as Carex lapponica O.Lang
     30. Variety Carex canescens var. longibracteata Porcius accepted as Carex canescens subsp. canescens L.
     31. Variety Carex canescens var. macilenta (F.Nyl.) Christ accepted as Carex macilenta F.Nyl.
     32. Variety Carex canescens var. maxima Kük. accepted as Carex heleonastes subsp. heleonastes Ehrh. ex L.f.
     33. Variety Carex canescens var. oregana L.H.Bailey accepted as Carex arcta Boott
     34. Variety Carex canescens var. persoonii Christ accepted as Carex brunnescens subsp. brunnescens (Pers.) Poir.
     35. Variety Carex canescens var. polystachya Boott accepted as Carex arcta Boott
     36. Variety Carex canescens var. robusta Blytt accepted as Carex canescens subsp. canescens L.
     37. Variety Carex canescens var. robustina Macoun accepted as Carex canescens subsp. canescens L.
     38. Variety Carex canescens var. sphaerostachya Tuck. accepted as Carex brunnescens subsp. sphaerostachya (Tuck.) Kalela
     39. Variety Carex canescens var. subelongata Laest. accepted as Carex canescens subsp. canescens L.
     40. Variety Carex canescens var. subloliacea Laest. accepted as Carex lapponica O.Lang
     41. Variety Carex canescens var. subloliacea Laest. accepted as Carex lapponica O.Lang
     42. Variety Carex canescens var. submuricata Laest. accepted as Carex canescens subsp. canescens L.
     43. Variety Carex canescens var. subtenella Kük. accepted as Carex canescens subsp. canescens L.
     44. Variety Carex canescens var. subvitilis Neuman accepted as Carex canescens subsp. canescens L.
     45. Variety Carex canescens var. tenuis O.Lang accepted as Carex canescens subsp. canescens L.
     46. Variety Carex canescens var. vitilis (Fr.) J.Carey accepted as Carex brunnescens subsp. brunnescens (Pers.) Poir.
     47. Variety Carex canescens var. vulgaris L.H.Bailey accepted as Carex brunnescens subsp. sphaerostachya (Tuck.) Kalela
     48. Subspecies Carex canescens subsp. brevispiculata Charit. (uncertain > unassessed)
     49. Subspecies Carex canescens subsp. hylaea (V.I.Krecz.) R.Knapp (uncertain > unassessed)
303. Species Carex canina Dunn
     1. Subspecies Carex canina subsp. canina Dunn
     2. Subspecies Carex canina subsp. collifera (Ohwi) X.F.Jin
304. Species Carex capensis Thunb.
305. Species Carex capillacea Boott
     1. Variety Carex capillacea var. capillacea Boott
     2. Variety Carex capillacea var. sachalinensis (F.Schmidt) Ohwi
     3. Subspecies Carex capillacea subsp. aomorensis (Franch.) T.V.Egorova accepted as Carex capillacea var. sachalinensis (F.Schmidt) Ohwi
     4. Variety Carex capillacea var. aomorensis (Franch.) Ohwi accepted as Carex capillacea var. sachalinensis (F.Schmidt) Ohwi
     5. Variety Carex capillacea var. linzensis Y.C.Yang accepted as Carex capillacea var. capillacea Boott
     6. Variety Carex capillacea var. yunnanensis Franch. accepted as Carex capillacea var. capillacea Boott
306. Species Carex capillaris L.
     1. Subspecies Carex capillaris subsp. capillaris L.
     2. Subspecies Carex capillaris subsp. fuscidula (V.I.Krecz. ex T.V.Egorova) Á.Löve & D.Löve
     3. Forma Carex capillaris f. alpestris Norm. accepted as Carex capillaris subsp. capillaris L.
     4. Forma Carex capillaris f. krausei (Boeckeler) Kük. accepted as Carex capillaris f. krauseorum (Boeckeler) Kük. (orthographic variant)
     5. Forma Carex capillaris f. krauseorum (Boeckeler) Kük. accepted as Carex krauseorum Boeckeler
     6. Forma Carex capillaris f. major Drejer accepted as Carex capillaris subsp. capillaris L.
     7. Forma Carex capillaris f. minima Beck accepted as Carex capillaris subsp. capillaris L.
     8. Forma Carex capillaris f. porsildiana (Polunin) Raymond accepted as Carex krauseorum subsp. porsildiana (Polunin) Á.Löve, D.Löve & Raymond
     9. Forma Carex capillaris f. saskatschewana (Boeckeler) L.H.Bailey accepted as Carex capillaris subsp. capillaris L.
     10. Forma Carex capillaris f. typica B.Boivin accepted as Carex capillaris L.
     11. Subspecies Carex capillaris subsp. chlorostachys (Steven) Á.Löve, D.Löve & Raymond accepted as Carex chlorostachys Steven
     12. Subspecies Carex capillaris subsp. densiflora Printz accepted as Carex delicata C.B.Clarke
     13. Subspecies Carex capillaris subsp. karoi Freyn accepted as Carex karoi Freyn
     14. Subspecies Carex capillaris subsp. krausei (Boeckeler) Böcher accepted as Carex capillaris subsp. krauseorum (Boeckeler) Böcher (orthographic variant)
     15. Subspecies Carex capillaris subsp. krauseorum (Boeckeler) Böcher accepted as Carex krauseorum Boeckeler
     16. Subspecies Carex capillaris subsp. ledebouriana (C.A.Mey. ex Trevir.) Vorosch. accepted as Carex ledebouriana C.A.Mey. ex Trevir.
     17. Subspecies Carex capillaris subsp. major (Drejer) Böcher accepted as Carex capillaris subsp. capillaris L.
     18. Subspecies Carex capillaris subsp. porsildiana (Polunin) Böcher accepted as Carex krauseorum subsp. porsildiana (Polunin) Á.Löve, D.Löve & Raymond
     19. Subspecies Carex capillaris subsp. robustior (Lange) Drejer ex Böcher accepted as Carex boecheriana Á.Löve, D.Löve & Raymond
     20. Variety Carex capillaris var. alpestris Andersson accepted as Carex capillaris L.
     21. Variety Carex capillaris var. capillaris L. accepted as Carex capillaris L.
     22. Variety Carex capillaris var. castanea Nyman accepted as Carex capillaris subsp. capillaris L.
     23. Variety Carex capillaris var. chlorostachys (Steven) Grossh. accepted as Carex chlorostachys Steven
     24. Variety Carex capillaris var. elongata Olney ex Fernald accepted as Carex capillaris subsp. capillaris L.
     25. Variety Carex capillaris var. krausei (Boeckeler) Kranz accepted as Carex capillaris var. krauseorum (Boeckeler) Kranz (orthographic variant)
     26. Variety Carex capillaris var. krauseorum (Boeckeler) Kranz accepted as Carex krauseorum Boeckeler
     27. Variety Carex capillaris var. ledebouriana (C.A.Mey. ex Trevir.) F.Schmidt accepted as Carex ledebouriana C.A.Mey. ex Trevir.
     28. Variety Carex capillaris var. ledebouriana Kük. accepted as Carex ledebouriana C.A.Mey. ex Trevir.
     29. Variety Carex capillaris var. ledebourii F.Schmidt accepted as Carex ledebouriana C.A.Mey. ex Trevir.
     30. Variety Carex capillaris var. major Drejer accepted as Carex capillaris subsp. capillaris L.
     31. Variety Carex capillaris var. minima Beck accepted as Carex capillaris L.
     32. Variety Carex capillaris var. nana Kük. accepted as Carex krauseorum subsp. krauseorum Boeckeler
     33. Variety Carex capillaris var. paludosa F.Schmidt accepted as Carex capillaris subsp. capillaris L.
     34. Variety Carex capillaris var. parvirostris Kük. accepted as Carex karoi Freyn
     35. Variety Carex capillaris var. pohuanshanensis Y.Yabe accepted as Carex chlorostachys var. chlorostachys Steven
     36. Variety Carex capillaris var. porsildiana Polunin accepted as Carex krauseorum subsp. porsildiana (Polunin) Á.Löve, D.Löve & Raymond
     37. Variety Carex capillaris var. regeliana Kük. accepted as Carex regeliana (Kük.) Litv.
     38. Variety Carex capillaris var. robustior Lange accepted as Carex boecheriana Á.Löve, D.Löve & Raymond
     39. Variety Carex capillaris var. robustior Drejer accepted as Carex capillaris subsp. capillaris L.
     40. Variety Carex capillaris var. tenuior Drejer accepted as Carex capillaris subsp. capillaris L.
     41. Variety Carex capillaris var. tenuior Lange accepted as Carex capillaris L.
     42. Variety Carex capillaris var. williamsii (Britton) B.Boivin accepted as Carex williamsii Britton
     43. Variety Carex capillaris var. drejer L. (uncertain > unassessed)
307. Species Carex capilliculmis S.R.Zhang
308. Species Carex capillifolia (Decne.) S.R.Zhang
309. Species Carex capilliformis Franch.
     1. Variety Carex capilliformis var. major Kük. accepted as Carex capilliformis Franch.
310. Species Carex capitata Sol.
     1. Forma Carex capitata f. alpicola Andersson accepted as Carex capitata Sol.
     2. Forma Carex capitata f. arctogena (Harry Sm.) Raymond accepted as Carex arctogena Harry Sm.
     3. Subspecies Carex capitata subsp. arctogena (Harry Sm.) Hiitonen accepted as Carex arctogena Harry Sm.
     4. Subspecies Carex capitata subsp. arctogena (Harry Sm.) Böcher accepted as Carex capitata Sol.
     5. Subspecies Carex capitata subsp. arctogena (Harry Sm.) Böcher ex Á.Löve, D.Löve & B.M.Kapoor accepted as Carex capitata Sol.
     6. Subspecies Carex capitata subsp. capitata Sol. accepted as Carex capitata Sol.
     7. Variety Carex capitata var. arctogena (Harry Sm.) Hultén accepted as Carex arctogena Harry Sm.
     8. Variety Carex capitata var. capitata Sol. accepted as Carex capitata Sol.
311. Species Carex capitellata Boiss. & Balansa
312. Species Carex capricornis Meinsh. ex Maxim.
     1. Variety Carex capricornis var. latifolia Honda accepted as Carex capricornis Meinsh. ex Maxim.
313. Species Carex cardiolepis Nees
314. Species Carex careyana Torr. ex Dewey
315. Species Carex cariei Aubin
316. Species Carex caroliniana Schwein.
317. Species Carex carsei Petrie
318. Species Carex caryophyllea Latourr.
     1. Variety Carex caryophyllea var. caryophyllea Latourr.
     2. Forma Carex caryophyllea f. argyrata (Waisb.) Kük. accepted as Carex caryophyllea Latourr.
     3. Forma Carex caryophyllea f. chlorantha (Waisb.) Kük. accepted as Carex caryophyllea Latourr.
     4. Forma Carex caryophyllea f. dissita Franch. ex Kük. accepted as Carex caryophyllea Latourr.
     5. Forma Carex caryophyllea f. globuliflora (Waisb.) Kük. accepted as Carex caryophyllea Latourr.
     6. Forma Carex caryophyllea f. glomerata (Waisb.) Kük. accepted as Carex caryophyllea Latourr.
     7. Forma Carex caryophyllea f. gynobasis P.Fourn. accepted as Carex caryophyllea Latourr.
     8. Forma Carex caryophyllea f. laxiflora (Waisb.) Kük. accepted as Carex caryophyllea Latourr.
     9. Forma Carex caryophyllea f. leiocarpa Franch. ex Kük. accepted as Carex caryophyllea Latourr.
     10. Forma Carex caryophyllea f. longibracteata (Beck) Kük. accepted as Carex caryophyllea Latourr.
     11. Forma Carex caryophyllea f. longivaginata (Kük.) Kük. accepted as Carex caryophyllea Latourr.
     12. Forma Carex caryophyllea f. luxurians (Kük.) Kük. accepted as Carex caryophyllea Latourr.
     13. Forma Carex caryophyllea f. monostachya Asch. & Graebn. accepted as Carex caryophyllea Latourr.
     14. Forma Carex caryophyllea f. pallescens Kneuck. accepted as Carex caryophyllea Latourr.
     15. Forma Carex caryophyllea f. pedunculata (Beck) Kük. accepted as Carex caryophyllea Latourr.
     16. Forma Carex caryophyllea f. pygmaea (F.Fleisch.) Kük. accepted as Carex caryophyllea Latourr.
     17. Forma Carex caryophyllea f. refracta (Roth) Kük. accepted as Carex caryophyllea Latourr.

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