Ceiba acuminata Celastrus scandens
Celosia argentea (Plumosa Group) Celosia argentea (Plumosa Group) 'Apricot Brandy'
Celosia argentea (Plumosa Group) 'Fresh Look Red' Celosia argentea (Plumosa Group) 'Fresh Look Yellow'
Celosia argentea (Plumosa Group) 'New Look' Celosia argentea (Plumosa Group) 'Pink Castle'
Celtis laevigata Celtis laevigata 'All Seasons'
Celtis laevigata var. smallii Celtis occidentalis
Celtis occidentalis 'Prairie Pride' Celtis pallida
Celtis reticulata Cephalanthus occidentalis
Cephalanthus occidentalis 'SMCOSS (Sugar Shack®)' Cephalocereus senilis
Cercis canadensis Cercis canadensis 'Alba'
Cercis canadensis 'Appalachia' Cercis canadensis 'Flame'
Cercis canadensis 'Forest Pansy' Cercis canadensis 'JN2 (The Rising Sun™)'
Cercis canadensis 'Silver Cloud' Cercis canadensis 'Wither's Pink Charm'
Cercis canadensis var. texensis Cercis mexicana
Cercis occidentalis Cercis reniformis 'Oklahoma'
Cercis reniformis 'Texas White' Cercocarpus ledifolius var. intricatus
Cercocarpus montanus var. blancheae Cestrum elegans
Cestrum fasciculatum Chamaecrista fasciculata
Chamaecyparis lawsoniana Chamaecyparis lawsoniana 'Aurea'
Chamaecyparis lawsoniana 'Aurea Compacta' Chamaecyparis lawsoniana 'Aurea Densa'
Chamaecyparis lawsoniana 'Columnaris' Chamaecyparis lawsoniana 'Erecta'
Chamaecyparis lawsoniana 'Fletcheri' Chamaecyparis lawsoniana 'Globosa Nana'
Chamaecyparis lawsoniana 'Green Pillar' Chamaecyparis lawsoniana 'Intertexta'
Chamaecyparis lawsoniana 'Lane' Chamaecyparis lawsoniana 'Lane's Aurea'
Chamaecyparis lawsoniana 'Minima Aurea' Chamaecyparis lawsoniana 'Pembury Blue'
Chamaecyparis lawsoniana 'Pottenii' Chamaecyparis lawsoniana 'Triomf van Boskoop'
Chamaecyparis lawsoniana 'Wisselii' Chamaecyparis lawsoniana 'Yvonne'
Chamaecyparis nootkatensis Chamaecyparis nootkatensis 'Aureo-variegata'
Chamaecyparis nootkatensis 'Pendula' Chamaecyparis thyoides
Chamaecyparis thyoides 'Andelyensis' Chamaecyparis thyoides 'Conica'
Chamaecyparis thyoides 'Ericoides' Chamaecyparis thyoides 'Heatherbun'
Chamaecyparis thyoides 'Rubicon' Chamaedorea elegans
Chamaedorea erumpens Chamaedorea microspadix
Chamaedorea seifrizii Chasmanthium latifolium
Cheilanthes lanosa Cheilanthes tomentosa
Chelidonium majus Chelone glabra
Chelone lyonii Chelone lyonii 'Hot Lips'
Chelone obliqua Chenopodium album
Chilopsis linearis Chilopsis linearis 'Burgundy'
Chimaphila maculata Chiococca alba
Chionanthus virginicus Chionanthus virginicus var. maritimus
Choisya ternata Choisya ternata 'Sundance'
Chrysobalanus icaco Chrysogonum virginianum
Chrysogonum virginianum 'Pierre' Chrysophyllum cainito
Chrysophyllum oliviforme Chrysothamnus paniculatus
Cirsium arvense Cirsium vulgare
Citharexylum fruticosum Cladrastis lutea
Cladrastis lutea 'Rosea' Clarkia amoena
Clarkia amoena 'Dwarf Mix Improved' Clarkia bottae
Clarkia pulchella Claytonia virginica