Callistemon acuminatus Callistemon citrinus
Callistemon citrinus 'Jeffersii' Callistemon viminalis
Calylophus berlandieri Calyptranthes pallens
Campanula punctata 'Cherry Bells' Campanula punctata 'Wedding Bells'
Campsis radicans Campsis x tagliabuana 'Kudan'
Campsis x tagliabuana 'Madame Galen' Carex grayi
Carnegiea gigantea Carpinus caroliniana
Carpinus caroliniana var. virginiana Carya aquatica
Carya ovata Carya ovata 'Grainger'
Carya ovata var. pubescens Casasia clusiifolia
Castanea pumila Castilleja californica
Cattleya maxima Celastrus scandens
Celtis laevigata Celtis laevigata var. smallii
Celtis occidentalis Celtis occidentalis 'Prairie Pride'
Celtis reticulata Centaurea cyanus
Centaurea cyanus 'Florence White' Centranthus ruber
Centranthus ruber 'Albus' Centranthus ruber 'Coccineus'
Cercis canadensis Cercis canadensis 'Alba'
Cercis canadensis 'Appalachia' Cercis canadensis 'Forest Pansy'
Cercis canadensis 'Silver Cloud' Cercis canadensis 'Wither's Pink Charm'
Cercis griffithii Cercis siliquastrum
Cerinthe major Cestrum aurantiacum
Cestrum elegans Cestrum elegans var. smithii
Chamaecyparis thyoides Chamaecyparis thyoides 'Andelyensis'
Chamaecyparis thyoides 'Ericoides' Chamaecyparis thyoides 'Heatherbun'
Chasmanthium latifolium Chelone glabra
Chelone lyonii Chelone obliqua
Chilopsis linearis Chilopsis linearis 'Burgundy'
Chiococca alba Chionanthus retusus
Chionanthus virginicus Chionanthus virginicus var. maritimus
Chrysobalanus icaco Chrysophyllum cainito
Cleistocactus baumannii Cleistocactus fieldianus
Cleistocactus samaipatanus Cleistocactus sextonianus
Cleistocactus strausii Clematis 'Sweet Summer Love'
Clerodendrum trichotomum var. fargesii 'Carnival' Clitoria ternatea
Coccoloba diversifolia Coccoloba microstachya
Coccoloba rugosa Coccoloba uvifera
Colubrina arborescens Condalia globosa
Cordia boissieri Cordia parvifolia
Coreopsis 'Tequila Sunrise' Coreopsis auriculata
Coreopsis auriculata 'Nana' Coreopsis gigantea
Coreopsis grandiflora 'Early Sunrise' Coreopsis grandiflora 'Sunray'
Coreopsis grandiflora 'Walcoreop(Flying Saucers )' Coreopsis lanceolata
Coreopsis lanceolata 'Baby Sun' Coreopsis lanceolata 'Goldfink'
Coreopsis lanceolata 'Sterntaler' Coreopsis tinctoria
Coreopsis tinctoria 'Mardi Gras' Coreopsis verticillata 'Golden Gain'
Coreopsis verticillata 'Golden Showers' Coreopsis verticillata 'Grandiflora'
Coreopsis verticillata 'Moonbeam' Coreopsis verticillata 'Zagreb'