| Carissa macrocarpa |
Natal Plum |
 |
| Carpanthea pomeridiana |
Golden Carpet |
 |
| Carpenteria californica |
Tree Anemone |
|
| Carthamnus tinctoria |
Saffron Thistle |
|
| Caryopteris x clandonensis |
Blue Mist Shrub |
|
| Cassia (many) |
Shower Tree |
 |
| Cassia |
Cassia, Shower Tree |
|
| Cassia grandis |
Coral Shower Tree, Pink Shower Tree |
|
| Cassiope hypnoides |
Cassiope |
|
| Casuarina equisetifolia |
Horsetail Tree |
|
| Catalpa bignoides |
Indian Bean Tree |
|
| Catalpa speciosa |
Northern Catalpa, Western Catalpa |
|
| Catananche caerulea |
Cupid's Dart |
 |
| Catharanthus roseus |
Madagascar Periwinkle |
|
| Cautleya spicata |
Ginger Lily |
|
| Ceanothus 'Autumnal Blue' |
Californian Lilac |
|
| Ceanothus thyrsiflorus |
Californian Lilac |
|
| Ceiba pentandra |
Kapok Tree |
|
| Celosia plumosa (argentea) |
Cockscomb |
|
| Celosia spicata |
Cockscomb |
|
| Centaurea cyanus |
Cornflower |
 |
| Centaurea nigra |
Knapweed |
|
| Centaurea scabiosa |
Greater Knapweed |
|
| Centaurium chloodes |
Centaury |
|
| Centaurium scilloides |
Centaury |
|
| Centranthus ruber |
Red Valerian |
|
| Cephalaria radiata |
Yellow Scabious |
|
| Cerastium arvense |
Field Mouse-Ear |
|
| Cerastium tomentosum |
Snow in Summer |
|
| Ceratonia siliqua |
Carob, Locust Tree |
|
| Ceratotheca triloba |
South African Foxglove |
|
| Cercis canadensis |
Eastern Redbud, Forest Pansy |
|
| Cercis siliquastrum |
Judas Tree |
|
| Cerinthe major purpurascens |
Honeywort |
|
| Cestrum newellii |
Red Cestrum |
|
| Chaenorrhinum glareosum |
Dwarf Snapdragon |
|
| Chaerophyllum hirsutum roseum |
Hairy Chervil |
|
| Chamaerops humilis |
Dwarf Fan Palm |
|
| Chamerion (Epilobium) angustifolium |
Rose Bay Willow Herb |
|
| Chamerion (Epilobium) crassum |
Willow Herb |
|
| Chamerion (Epilobium) dodonaei |
Willow Herb |
|
| Chamerion (Epilobium) hirsutum |
Great Willow Herb |
|
| Chamerion (Epilobium) sulphureum |
Willow Herb |
|
| Chasmanthe floribunda v duckettii |
Chasmanthe |
|
| Cheiranthus |
Wallflower |
|
| Chelone (many) |
Turtle Head |
|
| Chelone obliqua |
Turtle Head |
|
| Chiastophyllum oppositifolium |
Lamb's Tail |
|
| Chilopsis linearis |
Desert Willow |
|
| Chimonanthus praecox |
Winter Sweet |
|
| Chionodoxa forbesii |
Glory of the Snow |
|
| Chlidanthus fragrans |
Peruvian Daffodil |
|
| Chorisia insignis |
White Silk Floss Tree |
|
| Chorisia speciosa |
Silk Floss Tree |
|
| Chrysanthemum (many) |
Chrysanthemum |
|
| Chrysanthemum carinatum |
Annual Chrysanthemum |
|
| Chrysanthemum coronarium |
Crown Daisy |
|
| Chrysophyllum cainito |
Star Apple |
|
| Cichorium intybus |
Chicory |
|
| Cineraria (Pericallis) 'Erfurt Dwarf' |
Cineraria |
|
| Cistus (many) |
Rock Rose |
|
| Cistus symphytifolius |
Rock Rose |
|
| Cladanthus arabicus |
Palm Springs Daisy |
|
| Clarkia amoena |
Godetia |
|
| Clarkia bottae |
Botta's Fairyfan |
|
| Clarkia elegans |
Garland Flower |
|
| Claytonia megarrhiza |
Purslane |
|
| Clematis (many) |
Clematis |
|
| Clematis macropetala |
Clematis |
|
| Clematis vitalba |
Old Man's Beard, Traveller's Joy |
|
