Corylus americana Corylus colurna
Corymbia abergiana Corymbia eximia
Corymbia intermedia Corymbia leichhardtii
Corymbia maculata Corymbia watsoniana
Corynocarpus laevigata Corypha umbraculifera
Corypha utan Corytoplectus capitatus
Corytoplectus cutucuensis Cotinus coggygria
Cotinus coggygria 'Golden Spirit' Cotinus obovatus
Cotinus obovatus X C. coggygria Couroupita guianensis
Crataegus aestivalis Crataegus ambigua
Crataegus crus-galli Crataegus crus-galli 'Hooks'
Crataegus crus-galli var. inermis Crataegus laevigata
Crataegus laevigata 'Paul's Scarlet' Crataegus x lavallei
Crataegus mollis Crataegus monogyna
Crataegus monogyna 'Inermis Compacta' Crataegus paucispina
Crataegus phaenopyrum Crataegus punctata
Crataegus viridis 'Winter King' Crescentia cujete
Cryptocarya obovata Cryptocarya rubra
Cryptomeria japonica Cryptomeria japonica 'Black Dragon'
Cryptomeria japonica 'Crispa' Cryptomeria japonica 'Enko Sugi'
Cryptomeria japonica 'Globosa Nana' Cryptomeria japonica 'Gyokruya'
Cryptomeria japonica 'Hino' Cryptomeria japonica 'Kitayamaa'
Cryptomeria japonica 'Lobbi Nana' Cryptomeria japonica 'Rein's Dense Jade'
Cryptomeria japonica 'Sekkan Sugi' Cryptomeria japonica 'Yoshino'
Crysophila warscewiczii Cunninghamia lanceolata
Cunninghamia lanceolata 'Glauca' Cunninghamia lanceolata 'Samurai'
Cupaniopsis anacardiopsis X Cupressocyparis leylandii
X Cupressocyparis leylandii 'Golconda' X Cupressocyparis leylandii 'Haggerston Gray'
Cupressus arizonica Cupressus arizonica 'Blue Pyramid'
Cupressus arizonica 'Golden Pyramid' Cupressus arizonica var. arizonica
Cupressus arizonica var. glabra 'Aurea' Cupressus arizonica var. glabra 'Blue Ice'
Cupressus arizonica var. glabra 'Carolina Safire' Cupressus arizonica var. glabra 'Gareei'
Cupressus bakeri ssp. mathewsii Cupressus funebris
Cupressus gigantea Cupressus goveniana var. pygmaea
Cupressus guadalupensis Cupressus himalaica var. darjeelingensis
Cupressus lusitanica Cupressus macrocarpa
Cupressus macrocarpa 'Gold Pillar' Cupressus macrocarpa 'Horizontalis Aurea'
Cupressus macrocarpa 'Keown' Cupressus macrocarpa 'Lutea'
Cupressus sempervirens Cupressus sempervirens 'Stricta'
Cupressus sempervirens 'Swaine's Gold' Cupressus torulosa
Cussonia paniculata Cydonia oblonga
Cyrilla arida Cyrilla racemiflora
Cyrtostachys lakka Dacrydium cupressinum
Dalbergia sissoo Dalea spinosa
Daphniphyllum macropodum Davidia involucrata
Deckenia nobilis Delonix regia
Dictyosperma album var. aureum Dillenia indica
Dimocarpus longan Diospyros digyna
Diospyros ebenum Diospyros kaki
Diospyros texana Diospyros virginiana