| Common name (English) | |
|---|---|
| Cota austriaca | Austrian chamomile |
| Cotyledon orbiculata var. oblonga | |
| Cupressus funebris | Chinese Weeping Cypress |
| Cupressus torulosa | Himalayan Cypress |
| Cycas revoluta | Fern plant |
| Cyperus alternifolius subsp. flabelliformis | False papyrus |
| Dahlia coccinea | Red dahlia |
| Dahlia ×pinnata | Dahlia, Garden Dahlia |
| Datura innoxia | Angel's trumpet, Downy Thorn Apple |
| Datura metel | Fireweed |
| Datura stramonium | Jimson weed, Fireweed |
| Delonix regia | Flame of the forest; Royal poinciana; Flamboyan |
| Descurainia sophia | Flixweed |
| Dichondra micrantha | Kidneyweed |
| Diospyros kaki | Japanese persimmon |
| Diospyros lotus | Date plum, Caucasian Persimmon |
| Diplotaxis muralis | Teetulpa-weed |
| Dolichandra unguis-cati | Cat Claw |
| Dracocephalum officinale subsp. officinale | Hyssop |
| Duranta erecta | Golden dewdrops, Creeping skyflower, Forget-Me-Not-Tree |