Carolina Foxtail
Carolina Geranium
Carolina Horsenettle
Carolina Vervain
Carpet Phlox
Carpetweed
Carrizo Creek Globemallow
Carrizo Mountain Sandmat
Carrotleaf Biscuitroot
Carveseed
Cassava
Castalis
Castela
Castorbean
Cataiina Beardtongue
Catalpa
Catchbirdtree
Catchfly
Catchfly Prairie Gentian
Catclaw Acacia
Catclaw Mimosa
Catnip
Catnip Noseburn
Cattail
Cattle Saltbush
Cavedwelling Evening Primrose
Cavedwelling Primrose
Cayenne Pepper
Ceanothus
Cedar Sedge
Cedros Milkvetch
Celery
Centaury
Centranthus
Centrostegia
Ceratonia
Cereal Rye
Cerro Hawthorn
Chaffbush
Chaffweed
Chainfern
Chalk Dudleya
Chamaechaenactis
Chamisso Arnica