Culebra Thistle 
Cup Plant 
Cupid's dart 
Cutleaf coneflower 
Cymbolaena 
Dahlia x hortensis 
Dense Blazing Star 
Desert Marigold 
Desert yellow fleabane 
Desertbroom 
Devil's Beggarticks 
Devil's Grandmother 
Dicoma incana 
Diffuse Knapweed 
Diplostephium ericoides 
Diplostephium hartwegii 
Distephanus antandroy 
Doellia bovei 
Dorobaea pimpinellifolia 
Douglas' dustymaiden 
Dune Goldenrod 
Dusty daisy-bush 
Dusty Miller 
Dwarf Goldenrod