Centaurea sadleriana 
Centaurea scoparia 
Centaurea sinaica 
Centaurea thirkei 
Cerraja de Famara 
Chamaeleon comosus 
Chamisa 
Chamomile 
Chamomile Sunray 
Chardinia 
Chicoryleaf 
Chiliadenus iphionoides 
Chiliadenus montanus 
Chios Chamomile 
Chlamydophora 
Chresta sphaerocephala 
Chrysanthemum indicum 
Chrysanthemum morifolium 
Chrysolaena platensis 
Chuquiraga oppositifolia 
Cirsium phyllocephalum 
Climbing Hempvine 
Clustered Carline-Thistle 
Cnicus