| Scientific Name | Common Name(s) | Life History | Growth Form | |
|---|---|---|---|---|
|
Cassia brewsteri | Leichhardt Bean, Brewster's Cassia, Cigar Cassia | Annual | tree |
| Casuarina equisetifolia | beach sheoak, Australian Pine , Australian-pine , beach she-oak, beefwood, casuarina, coast she-oak, beach casuarina, Australian beefwood, beefwoodtree, coastal she-oak, horsetail she-oak, horsetailtree, ironwood, whistling-pine, whistlingtree | Perennial | tree | |
|
Catalpa bignonioides | Catalpa, Catawba, Indian bean catalpa, Southern catalpa, Cigar tree | Perennial | tree |
|
Catharanthus roseus | pink periwinkle, Madagascar periwinkle, bright eyes, Cape periwinkle, graveyardplant, rose periwinkle, rosy periwinkle, vinca, old-maid, old-maid-flower, Madagascan periwinkle, cayenne jasmine | Biennial | shrub |
|
Celastrus orbiculatus | Oriental bittersweet | Perennial | vine |
| Celtis occidentalis | northern hackberry , common hackberry, American hackberry, beaverwood | Perennial | tree | |
|
Cenchrus echinatus | southern sandbur, hedgehog grass, spiny sandbur, Mossman River grass, sandbur grass, sandspur, common sandbur, coastal sandbur, field sandbur, grassbur, innocent-weed, southern sandbur grass | Annual | grass |
| Cenchrus longispinus | bur grass, coast sandbur, field sandbur, long-spine sandbur, long-spined sandbur, mat sandbur, sandbur, Bohena beauty, dune sandbur, gentle Annie, hedgehog grass, mat sandbur grass, Victorian gin | Annual | grass | |
|
Centaurea diluta | North African knapweed, lesser star-thistle, spotted knapwed | Annual | forb |
|
Centaurea iberica | Iberian starthistle, Iberian knapweed | Perennial | forb |
| Centaurea montana | bachelor's buttons, mountain knapweed, mountain-bluet, perennial cornflower, mountain cornflower | Perennial | forb | |
|
Centaurea nigrescens | Tyrol knapweed, Alpine Knapweed, Short-fringe knapweed | Perennial | forb |
| Centaurea sulphurea | sulphur knapweed, Sicilian star thistle, Sicilian thistle, sulphur-color Sicilian thistle | Annual | forb | |
|
Centranthus ruber | fox-brush, Jupiter's-beard, red valerian, kiss-me-quick, red-valerian, spur-valerian, fox's-brush, Jupiter's beard, spur valerian, valerian, keys to heaven, Devil's beard, Pretty betsy, German lilac, red spurred valerian, sweet valerian | Perennial | forb |
| Centranthus ruber 'Albus' | white valerian | Annual | forb | |
|
Cercis canadensis | Eastern Redbud | Perennial | tree |
|
Cestrum parqui | Chilean jessamine, willow jessamine, green cestrum, green poison-berry, iodine-bush, willow-leaf-jessamine, willow jasmine, willow-leaved jasmine, Chilean flowering jessamine, Chilean cestrum, cestrum, gatecrasher weed | Perennial | shrub |
| Chasmanthe bicolor | two color cobra lily, red-and-green cobra lily, suurkanolpypie | Perennial | forb | |
|
Chasmanthe floribunda | African cornflag | Perennial | forb |
|
Chionochloa rubra | New Zealand tussock grass, red tussock, red tussock grass, haumata | Perennial | grass |
|
Chrysanthemoides monilifera | boneseed, salt bush, bitou bush, Higgin's curse, jungle flower, tick berry, bushtick, bush tickberry, brother berry, jungle weed, Mort's curse, South African star bush | Perennial | shrub |
|
Cinnamomum camphora | Camphor tree, Camphor laurel | Perennial | tree |
|
Cistus ladanifer | gum rock-rose, common gum cistus, labdanum | Perennial | shrub |
|
Cistus salviifolius | sage-leaved rock-rose, salvia cistus, Gallipoli rose | Perennial | shrub |
| Clematis terniflora | sweet autumn virginsbower | Perennial | vine |