| Scientific Name | Common Name(s) | Life History | Growth Form | |
|---|---|---|---|---|
|
Clematis vitalba | old man's beard, traveler's-joy | Perennial | vine |
| Clerodendrum bungei | Rose Glory Bower | Perennial | shrub | |
|
Clinopodium vulgare | wild basil, cushion calamint, dogmint, field basil, basilweed | Perennial | forb |
|
Colocasia esculenta | wild taro, coco-yam, eddo, elephant-ear-plant | Perennial | forb |
| Convallaria majalis | Lily of the Valley, May bells, Our Lady's tears, Mary's tears | Perennial | forb | |
|
Coprosma repens | creeping mirrorplant, looking-glass-plant, mirror-plant, Looking-glass-bush, New Zealand laurel, mirror bush, New Zealand mirrorbush, tree-bedstraw, taupata, looking glass bush, looking glass plant, creeping mirror plant | Perennial | shrub |
|
Cordyline australis | Cabbage palm, Cabbage tree | Perennial | tree |
|
Coreopsis lanceolata | garden coreopsis, lance-leaf tickseed | Perennial | forb |
|
Cornus kousa | Kousa Dogwood, Japanese Dogwood | Perennial | tree |
| Coronilla valentina ssp. glauca | Mediterranean crownvetch, glaucous scorpion-vetch, English rue | Perennial | shrub | |
|
Cortaderia selloana 'Pumila' | 'Pumila': dwarf pampas grass, Parent Species: Pampasgrass, Parent Species: pampas grass, Parent Species: Uruguayan pampas grass, Parent Species: silver pampas grass, Cortaderia 'Pumila', Pumila dwarf pampas grass, Pumila: Ivory Feathers | Perennial | grass |
|
Corymbia ficifolia | red-flowering gum, red-flower gum, Albany red flowering gum | Perennial | tree |
|
Cotoneaster dammeri 'Coral Beauty' | bearberry cotoneaster , ai sheng xun zi | Perennial | shrub |
| Cotoneaster franchetii | orange cotoneaster, cotoneaster, Franchet's cotoneaster | Perennial | shrub | |
|
Cotoneaster lacteus | Parney’s cotoneaster, late cotoneaster, milkflower cotoneaster, red clusterberry | ||
|
Cotoneaster pannosus | silverleaf cotoneaster, silver leaf cotoneaster, silver cotoneaster, silver-leaf cotoneaster, silver-leaved cotoneaster, velvet cotoneaster | Perennial | shrub |
| Crepis pulchra | smallflower hawksbeard | Annual | forb | |
|
Cupaniopsis anacardioides | carrotwood, beach-tamarind, cashew-leaf cupania, green-leaf-tamarind, tuckeroo, brush deal, cupania | Perennial | tree |
| Cuscuta japonica | Japanese dodder | |||
| Cutandia memphitica | Memphis grass | Annual | grass | |
| Cynodon 'PWIN04S' | Dog Tuff™ hybrid Bermudagrass | grass | ||
| Cynodon dactylon x Cynodon transvaalensis | hybrid bermudagrass | Perennial | grass | |
| Cynodon transvaalensis | African bermudagrass, African dogstooth grass, African dogtooth grass, Bermuda couch, Florida grass, Transvaal quick | Perennial | grass | |
|
Cyperus papyrus | papyrus, Egyptian paperplant | Perennial | |
|
Cytisus multiflorus | white spanishbroom, Portuguese broom, Spanish broom, white broom | Perennial | shrub |