Carex crawfordii Fern.
* Carex cf. deweyana Schwein.
Carex diandra Schrank
Carex disperma Dew.
* Carex eburnea Boott
Carex filifolia Nutt.
Carex garberi Fern. ssp. bifaria (Fern.) Hulten
* Carex gynocrates Wormsk. ex Drej. [= Carex dioica L. ssp. gynocrates (Wormsk.) Hulten]
* Carex kelloggii W. Boott
Carex krausei Boeckl.
* Carex lachenalii Schkuhr.
Carex limosa L.
* Carex livida (Wahlenb.) Willd.
* Carex lugens Holm
* Carex macloviana d'Urv. [= Carex macloviana d'Urv. ssp. pachystachya (Cham.) Hulten]
Carex magellanica Lam. ssp. irrigua (Wahlenb.) Hulten
Carex media R. Br.
* Carex membranacea Hook.
* Carex microchaeta Holm
Carex microchaeta Holm ssp. microchaeta
Carex microchaeta Holm ssp. nesophila (Holm) D. Murray
* Carex microglochin Wahlenb.
Carex oederi Retz. ssp. viridula (Michx.) Hulten
* Carex petricosa Dewey
Carex podocarpa R. Br.
Carex rostrata Stokes
Carex rotundata Wahlenb.
Carex cf. rotundata Wahlenb.
Carex rupestris All.
Carex saxatilis L. ssp. laxa (Trautv.) Kalela
* Carex scirpoidea Michx.
Carex supina Willd. ex Wahlenb. var. spaniocarpa (Steud.) Boivin
Carex sychnocephala Carey
Carex tenuiflora Wahlenb.
Carex utriculata Boott [= Carex rhynchophysa C. A. Meyer]
Carex vaginata Tausch
* Carex williamsii Britt.
Cassiope tetragona (L.) D. Don ssp. tetragona
Castilleja caudata (Pennell) Rebr.
* Castilleja yukonis Pennell
* Cerastium beeringianum Cham. & Schlecht.
* Cerastium beeringianum Cham. & Schlecht. var. beeringianum
* Cerastium fontanum Baumg.
Chamaedaphne calyculata (L.) Moench
Chenopodium album L.
Chenopodium capitatum (L.) Aschers.
Chrysosplenium tetrandrum (Lund) Th. Fries
* Chrysosplenium wrightii Franch. & Savigny
* Claytonia sarmentosa C.A. Mey.
* Claytonia tuberosa Pallas ex J.A. Schultes
Cnidium cnidiifolium (Turcz.) Schischk.
Comarum palustre L. [= Potentilla palustris (L.) Scop.]
Corallorrhiza trifida Chatelain
Cornus canadensis L.
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