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- Carex rariflora (Wahlenberg) Smith accepted species
- Carex rariflora subsp. pluriflora (Hultén) T.V. Egorova synonym of Carex pluriflora
- Carex rariflora var. androgyna A.E. Porsild synonym of Carex rariflora
- Carex rariflora var. pluriflora (Hultén) B. Boivin synonym of Carex pluriflora
- Carex rariflora (Wahlenberg) Smith var. rariflora synonym of Carex rariflora
- carex rariflore accepted French vernacular name for Carex rariflora
- Carex raymondii Calder synonym of Carex atratiformis
- Carex raynoldsii Dewey accepted species
- carex rayonnant accepted French vernacular name for Carex radiata
- Carex recta Boott accepted species
- Carex recta × Carex stricta accepted species
- Carex rectior Mackenzie synonym of Carex granularis
- carex réfléchi accepted French vernacular name for Carex retrorsa
- carex remarquable accepted French vernacular name for Carex spectabilis
- Carex retrocurva Dewey synonym of Carex laxiculmis var. laxiculmis
- Carex retroflexa Muhlenberg ex Willdenow accepted species
- carex rétroflexe accepted French vernacular name for Carex retroflexa
- Carex retrorsa Schweinitz accepted species
- Carex retrorsa var. hartii (Dewey) A. Gray synonym of Carex ×hartii
- Carex retrorsa var. macounii Dewey synonym of Carex lupulina
- Carex rhomalea (Fernald) Mackenzie synonym of Carex saxatilis
- Carex rhomboidea Holm synonym of Carex aquatilis var. aquatilis
- Carex rhynchophysa Fischer, C.A. Meyer & Avé-Lallemant synonym of Carex utriculata
- Carex richardii Thuillier synonym of Carex canescens subsp. canescens
- Carex richardsonii R. Brown accepted species
- carex riche accepted French vernacular name for Carex aquatilis var. dives
- Carex richiii (Fernald) Mackenzie synonym of Carex straminea
- Carex rigida Goodenough synonym of Carex bigelowii subsp. bigelowii
- Carex rigida var. bigelowii (Torrey ex Schweinitz) Tuckerman synonym of Carex bigelowii subsp. bigelowii
- Carex rigida var. concolor (R. Brown) Kükenthal synonym of Carex bigelowii subsp. bigelowii
- Carex rigida var. goodenovii L.H. Bailey synonym of Carex nigra
- Carex rigida var. strictiformis (L.H. Bailey) L.H. Bailey synonym of Carex nigra
- Carex riparia var. acutiformis (Ehrhart) Fiori synonym of Carex acutiformis
- Carex riparia var. lacustris (Willdenow) Kükenthal synonym of Carex lacustris
- Carex rosea auct. non Schkuhr ex Willdenow synonym of Carex radiata
- Carex rosea Schkuhr ex Willdenow accepted species
- Carex rosea var. minor Boott synonym of Carex radiata
- Carex rosea var. radiata (Wahlenberg) Dewey synonym of Carex radiata
- Carex rosea var. retroflexa (Muhlenberg ex Willdenow) Torrey synonym of Carex retroflexa
- Carex rossii Boott accepted species
- Carex rossii var. brevipes (W. Boott ex B.D. Jackson) Kükenthal synonym of Carex deflexa var. boottii
- Carex rostrata Stokes nom. cons. accepted species
- Carex rostrata Michaux nom. illeg. synonym of Carex michauxiana
- Carex rostrata subsp. rotundata (Wahlenberg) Kükenthal synonym of Carex rotundata
- Carex rostrata subsp. utriculata (Boott) Ascherson & Graebner synonym of Carex utriculata
- Carex rostrata var. ambigens Fernald synonym of Carex rostrata
- Carex rostrata var. anticostensis (Fernald) Fernald synonym of Carex ×stenolepis
- Carex rostrata var. borealis (Hartman) Kükenthal synonym of Carex ×saamica
- Carex rostrata Stokes var. rostrata synonym of Carex rostrata
- Carex rostrata var. utriculata (Boott) L.H. Bailey synonym of Carex utriculata