Carnegiea gigantea Carpobrotus aequilaterus
Carpobrotus chilensis Carpobrotus edulis
Castilleja californica Catananche caerulea
Catananche caerulea 'Cupid's Dart' Catharanthus roseus
Catharanthus roseus 'First Kiss Blueberry' Catharanthus roseus 'Jaio Dark Red'
Catharanthus roseus 'Jaio Scarlet Eye' Catharanthus roseus 'Parasol'
Catharanthus roseus 'Pastels Mix' Catharanthus roseus 'Pretty in Rose'
Catharanthus roseus 'Raspberry Cooler' Catharanthus roseus 'Rose Carpet'
Catharanthus roseus 'Stardust Mix' Catharanthus roseus 'Stardust Orchid'
Cattleya x Cattleya x 'Kodama'
Cattleya x 'Luteus Forb' Cattleya maxima
Celosia argentea (Cristata Group) Celosia argentea (Cristata Group) 'Amigo'
Celosia argentea (Cristata Group) 'Bombay Purple' Celosia argentea (Cristata Group) 'Bombay Yellow Gold'
Celosia argentea (Cristata Group) 'Jewel Box Golden Yellow' Celosia argentea (Cristata Group) 'Jewel Box Salmon'
Celosia argentea (Cristata Group) 'Kardinal Improved' Celosia argentea (Cristata Group) 'Karume'
Celosia argentea (Cristata Group) 'Prestige Scarlet' Celosia argentea (Cristata Group) 'Purple with purple leaves'
Celosia argentea (Cristata Group) 'Red Velvet' Celosia argentea (Cristata Group) 'Startrek Rose Pink'
Celosia argentea (Plumosa Group) Celosia argentea (Plumosa Group) 'Apricot Brandy'
Celosia argentea (Plumosa Group) 'Castle Orange' Celosia argentea (Plumosa Group) 'Fresh Look Gold'
Celosia argentea (Plumosa Group) 'Fresh Look Orange' Celosia argentea (Plumosa Group) 'Fresh Look Red'
Celosia argentea (Plumosa Group) 'Fresh Look Yellow' Celosia argentea (Plumosa Group) 'New Look'
Celosia argentea (Plumosa Group) 'Orange Kewpie' Celosia argentea (Plumosa Group) 'Pink Castle'
Celosia argentea (Plumosa Group) 'Red Kewpie' Celosia argentea (Plumosa Group) 'Yellow'
Celosia argentea (Spicata Group) Celosia argentea (Spicata Group) 'Flamingo'
Celosia argentea (Spicata Group) 'Kosmo Purple Red' Celosia argentea (Spicata Group) 'Purple Flamingo'
Centaurea 'Pulchra Major' Centaurea cineraria 'Colchester White'
Centaurea cyanus Centaurea cyanus 'Florence White'
Centaurea dealbata Centaurea dealbata 'Rose'
Centaurea hypoleuca 'John Coutts' Centaurea macrocephala
Centaurea montana Centaurea montana 'Alba'
Centaurea montana 'Aurea' Centaurea montana 'Blue'
Centaurea montana 'Gold Bullion' Centranthus ruber
Centranthus ruber 'Albus' Centranthus ruber 'Coccineus'
Cephalocereus purpureus Cephalocereus senilis
Cephalophyllum spongiosum Cephalophyllum subulatoides
Cerastium tomentosum Cerastium tomentosum 'Silberteppick'
Cerastium tomentosum 'Yo Yo' Ceratostigma plumbaginoides
Cereus horridus var. macrocarpus Cereus uruguayanus
Cereus uruguayanus 'Monstrosus' Cereus validus
Cerinthe major Ceropegia linearis ssp. woodii
Ceropegia sandersoniae Chaenorrhinum origanifolium 'Summer Skies'
Chamaecrista fasciculata Chamaelirium luteum
Chamaemelum nobile Chasmanthe bicolor
Chasmanthium latifolium Cheilanthes argentea
Cheilanthes lanosa Cheilanthes tomentosa
Cheiridopsis aspera Cheiridopsis cigarettifera
Cheiridopsis denticulata Chelidonium japonicum
Chelidonium majus Chelone glabra
Chelone lyonii Chelone lyonii 'Hot Lips'
Chelone obliqua Chenopodium album