| Common name (English) | |
|---|---|
| Brugmansia sanguinea | Red floripontio |
| Brugmansia suaveolens | Angel's tears |
| Buddleja davidii | Butterfly Bush |
| Buddleja madagascariensis | |
| Buxus sempervirens | Caucasian boxwood, Common box, Boxwood |
| Calendula officinalis | |
| Callistemon lanceolatus | Bottlebrush |
| Campsis grandiflora | Chinese trumpet vine |
| Campsis radicans | Trumpet Creeper; trumpet vine; yellow trumpet vine |
| Cardiospermum halicacabum | Balloon vine |
| Carissa macrocarpa | Natal Plum |
| Carpobrotus acinaciformis | |
| Carpobrotus edulis | Hottentot-fig |
| Cassia artemisioides | Silver Senna, Feathery Senna |
| Casuarina equisetifolia | Australian beefwood; Forest oak; Shingle oak |
| Casuarina glauca | Swamp oak |
| Catalpa bignonioides | Catawba |
| Catharanthus roseus | Madagascar periwinkle |
| Cedrus atlantica | Atlantic cedar |
| Cedrus deodara | Deodar |