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Cirsium inamoenum, Cirsium inamoenum var. davisii, Cirsium inamoenum var. inamoenum, Cirsium joannae, Cirsium occidentale var. californicum, Cirsium occidentale var. lucianum, Cirsium ochrocentrum var. martinii, Cirsium pulcherrimum var. aridum, Cirsium scariosum var. americanum, Cirsium scariosum var. citrinum, Cirsium scariosum var. coloradense, Cirsium scariosum var. congdonii, Cirsium scariosum var. robustum, Cirsium scariosum var. toiyabense, Clarkia concinna subsp. raichei, Clarkia heterandra, Clarkia mildrediae subsp. lutescens, Clarkia speciosa subsp. nitens, Clarkia subsect. Connubium, Clarkia subsect. Heterogaura, Clarkia xantiana subsp. parviflora, Claytonia exigua subsp. glauca, Claytonia parviflora subsp. grandiflora, Claytonia parviflora subsp. utahensis, Claytonia parviflora subsp. viridis, Claytonia perfoliata subsp. intermontana, Claytonia perfoliata subsp. mexicana, Claytonia rubra subsp. depressa, Cleistes bifaria, Cleomella hillmanii var. goodrichii, Cleoserrata, Cleoserrata serrata, Cleoserrata speciosa, Collinsia latifolia, Columbiadoria, Columbiadoria hallii, Combretum indicum, Commelina diffusa var. gigas, Conoclinium betonicifolium var. integrifolium, Constancea, Constancea nevinii, Corallorhiza bentleyi, Corallorhiza odontorhiza var. pringlei, Corispermum americanum var. rydbergii, Corispermum hookeri, Corispermum hookeri var. hookeri, Corispermum hookeri var. pseudodeclinatum, Corispermum navicula, Corispermum ochotense var. alaskanum, Corispermum pacificum