| Carex adusta | Synonymy | Records | Description |
| Carex alopecoidea | Synonymy | Records | Description |
| Carex aquatilis | Synonymy | Records | Description |
| Carex arcta | Synonymy | Records | Description |
| Carex arctata | Synonymy | Records | Description |
| Carex argyrantha | Synonymy | Records | Description |
| Carex assiniboinensis | Synonymy | Records | Description |
| Carex atherodes | Synonymy | Records | Description |
| Carex atratiformis | Synonymy | Records | Description |
| Carex atrofusca | Synonymy | Records | Description |
| Carex aurea | Synonymy | Records | Description |
| Carex backii | Synonymy | Records | Description |
| Carex bebbii | Synonymy | Records | Description |
| Carex bicknellii | Synonymy | Records | Description |
| Carex bicolor | Synonymy | Records | Description |
| Carex bigelowii | Synonymy | Records | Description |
| Carex blanda | Synonymy | Records | Description |
| Carex brevior | Synonymy | Records | Description |
| Carex brunnescens | Synonymy | Records | Description |
| Carex brunnescens subsp. brunnescens | Synonymy | Records | Description |
| Carex buxbaumii | Synonymy | Records | Description |
| Carex canescens | Synonymy | Records | Description |
| Carex capillaris | Synonymy | Records | Description |
| Carex capitata | Synonymy | Records | Description |
| Carex castanea | Synonymy | Records | Description |
| Carex chordorrhiza | Synonymy | Records | Description |
| Carex communis | Synonymy | Records | Description |
| Carex comosa | Synonymy | Records | Description |
| Carex concinna | Synonymy | Records | Description |
| Carex conoidea | Synonymy | Records | Description |
| Carex crawei | Synonymy | Records | Description |
| Carex crawfordii | Synonymy | Records | Description |
| Carex crinita | Synonymy | Records | Description |
| Carex cristatella | Synonymy | Records | Description |
| Carex cryptolepis | Synonymy | Records | Description |
| Carex cumulata | Synonymy | Records | Description |
| Carex debilis | Synonymy | Records | Description |
| Carex deflexa | Synonymy | Records | Description |
| Carex deweyana | Synonymy | Records | Description |
| Carex diandra | Synonymy | Records | Description |
| Carex disperma | Synonymy | Records | Description |
| Carex douglasii | Synonymy | Records | Description |
| Carex eburnea | Synonymy | Records | Description |
| Carex echinata | Synonymy | Records | Description |
| Carex echinata subsp. echinata | Synonymy | Records | Description |
| Carex emoryi | Synonymy | Records | Description |
| Carex exilis | Synonymy | Records | Description |
| Carex festucacea | Synonymy | Records | Description |
| Carex flacca | Synonymy | Records | Description |
| Carex flava | Synonymy | Records | Description |
| Carex foenea | Synonymy | Records | Description |
| Carex folliculata | Synonymy | Records | Description |
| Carex garberi | Synonymy | Records | Description |
| Carex glacialis | Synonymy | Records | Description |
| Carex glareosa | Synonymy | Records | Description |
| Carex gracilescens | Synonymy | Records | Description |
| Carex gracillima | Synonymy | Records | Description |
| Carex granularis | Synonymy | Records | Description |
| Carex gravida | Synonymy | Records | Description |
| Carex gynandra | Synonymy | Records | Description |
| Carex gynocrates | Synonymy | Records | Description |
| Carex haydenii | Synonymy | Records | Description |
| Carex heleonastes | Synonymy | Records | Description |
| Carex houghtoniana | Synonymy | Records | Description |
| Carex hystericina | Synonymy | Records | Description |
| Carex interior | Synonymy | Records | Description |
| Carex intumescens | Synonymy | Records | Description |
| Carex krausei | Synonymy | Records | Description |
| Carex lacustris | Synonymy | Records | Description |
| Carex laeviconica | Synonymy | Records | Description |
| Carex lasiocarpa | Synonymy | Records | Description |
| Carex laxiflora | Synonymy | Records | Description |
| Carex lenticularis | Synonymy | Records | Description |
| Carex leptalea | Synonymy | Records | Description |
| Carex leptonervia | Synonymy | Records | Description |
| Carex limosa | Synonymy | Records | Description |
| Carex livida | Synonymy | Records | Description |
| Carex loliacea | Synonymy | Records | Description |
| Carex lucorum | Synonymy | Records | Description |
| Carex lupulina | Synonymy | Records | Description |
| Carex lurida | Synonymy | Records | Description |
| Carex mackenziei | Synonymy | Records | Description |
| Carex magellanica | Synonymy | Records | Description |
| Carex magellanica subsp. irrigua | Synonymy | Records | Description |
| Carex marina | Synonymy | Records | Description |
| Carex maritima | Synonymy | Records | Description |
| Carex media | Synonymy | Records | Description |
| Carex merritt-fernaldii | Synonymy | Records | Description |
| Carex michauxiana | Synonymy | Records | Description |
| Carex microglochin | Synonymy | Records | Description |
| Carex muehlenbergii | Synonymy | Records | Description |
| Carex muricata | Synonymy | Records | Description |
| Carex nardina | Synonymy | Records | Description |
| Carex normalis | Synonymy | Records | Description |
| Carex norvegica | Synonymy | Records | Description |
| Carex novae-angliae | Synonymy | Records | Description |
| Carex obtusata | Synonymy | Records | Description |
| Carex oligosperma | Synonymy | Records | Description |
| Carex ormostachya | Synonymy | Records | Description |
| Carex paleacea | Synonymy | Records | Description |
| Carex pallescens | Synonymy | Records | Description |
| Carex parryana | Synonymy | Records | Description |
| Carex pauciflora | Synonymy | Records | Description |
| Carex peckii | Synonymy | Records | Description |
| Carex pedunculata | Synonymy | Records | Description |
| Carex pellita | Synonymy | Records | Description |
| Carex pensylvanica | Synonymy | Records | Description |
| Carex plantaginea | Synonymy | Records | Description |
| Carex praegracilis | Synonymy | Records | Description |
| Carex prairea | Synonymy | Records | Description |
| Carex praticola | Synonymy | Records | Description |
| Carex projecta | Synonymy | Records | Description |
| Carex pseudocyperus | Synonymy | Records | Description |
| Carex radiata | Synonymy | Records | Description |
| Carex rariflora | Synonymy | Records | Description |
| Carex retrorsa | Synonymy | Records | Description |
| Carex richardsonii | Synonymy | Records | Description |
| Carex rosea | Synonymy | Records | Description |
| Carex rossii | Synonymy | Records | Description |
| Carex rostrata | Synonymy | Records | Description |
| Carex rupestris | Synonymy | Records | Description |
| Carex salina | Synonymy | Records | Description |
| Carex sartwellii | Synonymy | Records | Description |
| Carex saxatilis | Synonymy | Records | Description |
| Carex saximontana | Synonymy | Records | Description |
| Carex scabrata | Synonymy | Records | Description |
| Carex scirpoidea | Synonymy | Records | Description |
| Carex scirpoidea subsp. convoluta | Synonymy | Records | Description |
| Carex scirpoidea subsp. scirpoidea | Synonymy | Records | Description |
| Carex scoparia | Synonymy | Records | Description |
| Carex siccata | Synonymy | Records | Description |
| Carex sparganioides | Synonymy | Records | Description |
| Carex sprengelii | Synonymy | Records | Description |
| Carex sterilis | Synonymy | Records | Description |
| Carex stipata | Synonymy | Records | Description |
| Carex stricta | Synonymy | Records | Description |
| Carex subspathacea | Synonymy | Records | Description |
| Carex supina | Synonymy | Records | Description |
| Carex supina subsp. spaniocarpa | Synonymy | Records | Description |
| Carex sychnocephala | Synonymy | Records | Description |
| Carex tenera | Synonymy | Records | Description |
| Carex tenera var tenera | Synonymy | Records | Description |
| Carex tenuiflora | Synonymy | Records | Description |
| Carex tetanica | Synonymy | Records | Description |
| Carex tincta | Synonymy | Records | Description |
| Carex tonsa | Synonymy | Records | Description |
| Carex tonsa var rugosperma | Synonymy | Records | Description |
| Carex tonsa var tonsa | Synonymy | Records | Description |
| Carex torreyi | Synonymy | Records | Description |
| Carex tribuloides | Synonymy | Records | Description |
| Carex trisperma | Synonymy | Records | Description |
| Carex tuckermanii | Synonymy | Records | Description |
| Carex umbellata | Synonymy | Records | Description |
| Carex utriculata | Synonymy | Records | Description |
| Carex vaginata | Synonymy | Records | Description |
| Carex vesicaria | Synonymy | Records | Description |
| Carex viridula | Synonymy | Records | Description |
| Carex viridula subsp. viridula | Synonymy | Records | Description |
| Carex vulpinoidea | Synonymy | Records | Description |
| Carex wiegandii | Synonymy | Records | Description |
| Carex williamsii | Synonymy | Records | Description |
| Carex xerantica | Synonymy | Records | Description |
| Carex x knieskernii | Synonymy | Records | Description |