Chaenostoma cordatum 
Chelan Penstemon 
Chinese privet 
Chinese Rain Bell 
Chinese Trumpet Vine 
Chinese violet 
Chrysothemis friedrichsthaliana 
Chrysothemis melittifolia 
Chuparosa 
Cistanche lutea 
Cistanche mimii 
Cistanche salsa 
Cistanche tubulosa 
Cleonia lusitanica 
Clerodendrum deflexum 
Clerodendrum palmatolobatum 
Clerodendrum quadriloculare 
Clinopodium douglasii 
Coastal Hedgenettle 
Coastal Rosemary 
Cobaea Beardtongue 
Codonoboea quinquevulnera 
Colea fusca 
Coleus