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 (Spicata Group) Centaurea 'Pulchra Major'
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
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
Chimaphila maculata Chimonobambusa marmorea
Chionochloa flavescens Chionodoxa forbesii
Chionodoxa luciliae Chionodoxa luciliae 'Pink Giant'
Chirita x 'Moon Walker' Chirita eburnea
Chlorophytum comosum Chlorophytum comosum 'Variegatum'
Chrysogonum virginianum Chrysogonum virginianum 'Pierre'
Chrysopsis graminifolia Chrysothemis pulchella
Cicerbita plumieri Cichorium intybus
Cichorium intybus 'Marina' Cirsium arvense
Cissus discolor Cissus rhombifolia
Cissus rhombifolia 'Ellen Danica' Cissus rhombifolia 'Mandaiana'
Claytonia virginica Cleistocactus baumannii
Cleistocactus fieldianus Cleistocactus hyalacanthus
Cleistocactus samaipatanus Cleistocactus sextonianus
Cleistocactus strausii