Callirhoe involucrata. 58
Calylophus lavandulifolius. 17
Calylophus serrulatus. 20
Camphor weed. 147
Castilleja purpurea var. citrina. 247
Castilleja purpurea var. purpurea. 248
Ceanothus herbaceous, var. pubescens. 42
Chamaesaracha coniodes. 89
Chrysopsis villosa var. villosa. 161
Ciliate goldenweed. 151
Cirsium ochrocentrum. 195
Cirsium undulatum. 196
Clammyweed. 8
Columnar coneflower. 124
Comandra umbellata, ssp. pallida. 76
Common evening primrose. 22
Common goldenrod. 142
Common prickly pear. 119
Common sunflower. 156
Common yarrow. 138
Coreopsis tinctoria. 157
Croton texensis. 261
Cryptantha minima. 85
Cryptantha. 85
Cucurbita foetidissima. 92
Cupseed stickseed. 83
Curlycup gumweed. 191
Cutleaf ironplant. 159
Cyperus esculentus. 264