Chamaelirium luteum Chamaemelum nobile
Chamaerops humilis Chamelaucium floriferum
Chamelaucium uncinatum 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
Chilopsis linearis Chilopsis linearis 'Burgundy'
Chimaphila maculata Chimonanthus praecox
Chimonobambusa marmorea Chiococca alba
Chionanthus retusus Chionanthus virginicus
Chionanthus virginicus var. maritimus Chionochloa flavescens
Chionodoxa forbesii Chionodoxa luciliae
Chionodoxa luciliae 'Pink Giant' X Chiranthofremontia lenzii
Chirita x 'Moon Walker' Chirita eburnea
X Chitalpa tashkentensis X Chitalpa tashkentensis 'Morning Cloud'
X Chitalpa tashkentensis 'White Morning Cloud' Chlorophora tinctoria
Chlorophytum comosum Chlorophytum comosum 'Variegatum'
Choisya ternata Choisya ternata 'Sundance'
Choricarpia leptopetala Chorisia insignis
Chorisia speciosa Chorizema x 'Bush Flame'
Chorizema cordata Chorizema cordata x illicifolia
Chorizema ilicifolia Chrysalidocarpus cabadae
Chrysalidocarpus lutescens Chrysanthemum x 'Minnruby'
Chrysanthemum carinatum Chrysanthemum coronarium 'Primrose Gem'
Chrysobalanus icaco Chrysocephalum 'Flambe™ Orange'
Chrysocephalum 'Flambe™ Yellow' Chrysocephalum apiculatum 'Flochrora (Flambe® Orange)'
Chrysogonum virginianum Chrysogonum virginianum 'Pierre'
Chrysophyllum cainito Chrysophyllum oliviforme
Chrysopsis graminifolia Chrysothamnus paniculatus
Chrysothemis pulchella Cicerbita plumieri
Cichorium intybus Cichorium intybus 'Marina'
Cinnamomum aromaticum Cinnamomum brevifolium
Cinnamomum camphora Cinnamomum glanduliferum
Cinnamomum verum Cirsium arvense
Cirsium vulgare Cissus discolor
Cissus rhombifolia Cissus rhombifolia 'Ellen Danica'
Cissus rhombifolia 'Mandaiana' Cissus spp.
Cistus x Cistus x 'Grayswood Pink'
Cistus 'Santa Cruz' Cistus 'Snow Fire'
Cistus 'Victor Reiter' Cistus x argenteus 'Blushing Peggy Sammons'
Cistus x corbariensis Cistus crispus
Cistus ladanifer Cistus psilosepalus
Cistus x pulverulentus 'Sunset' Cistus x purpureus
Cistus salviifolius Cistus salviifolius 'Prostratus'
Cistus x skanbergii Citharexylum fruticosum
Citriobatus pauciflorus Citriobatus spinescens