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- Carex concinna
- Carex diandra
- Carex flava
- Carex garberi
- Carex glacialis
- Carex glareosa
- Carex glareosa subsp. glareosa
- Carex gynandra
- Carex gynocrates
- Carex holostoma
- Carex lachenalii
- Carex leptalea
- Carex magellanica
- Carex magellanica subsp. irrigua
- Carex marina
- Carex maritima
- Carex membranacea
- Carex microglochin
- Carex microglochin subsp. microglochin
- Carex nardina
- Carex norvegica
- Carex rariflora
- Carex rostrata
- Carex rufina
- Carex saxatilis
- Carex sterilis
- Carex subspathacea
- Carex supina
- Carex supina subsp. spaniocarpa
- Carex trisperma
- Carex ursina
- Carex utriculata
- Carex vaginata
- Carex williamsii
- Cassiope tetragona
- Cassiope tetragona subsp. tetragona
- Castilleja elegans
- Castilleja pallida
- Castilleja pallida var. caudata
- Castilleja raupii
- Castilleja septentrionalis
- Catoscopium nigritum
- Cerastium alpinum
- Cerastium alpinum subsp. alpinum
- Cerastium alpinum subsp. lanatum
- Cerastium arcticum
- Cerastium arvense
- Cerastium arvense subsp. strictum
- Cerastium beeringianum
- Cerastium bialynickii