Cryptomeria japonica Cryptomeria japonica 'Black Dragon'
Cryptomeria japonica 'Crispa' Cryptomeria japonica 'Elegans'
Cryptomeria japonica 'Elegans Nana' 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 'Vilmoriniana'
Cryptomeria japonica 'Yoshino' Cryptotaenia japonica 'Atropurpurea'
Crysophila warscewiczii Ctenanthe oppenheimiana 'Tricolor'
Cucumis melo Cucumis melo 'Angel'
Cucumis sativus 'Diva' Cucurbita 'Cornell's'
Cucurbita 'Papaya Pear' Cucurbita palmata
Cucurbita pepo 'Butterstick' Cucurbita pepo 'Orange Smoothie'
Cucurbita pepo 'Sorcerer' Cucurbita pepo 'Sunshine'
Cunninghamia lanceolata Cunninghamia lanceolata 'Glauca'
Cunninghamia lanceolata 'Samurai' Cupaniopsis anacardiopsis
Cuphea 'David Verity' Cuphea 'Flamenco Samba'
Cuphea 'Twinkle Pink' Cuphea hyssopifola
Cuphea ignea Cuphea lanceolata
Cuphea llavea Cuphea micropetala
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 Curcuma alismatifolia
Curcuma australasica Curcuma elata
Curcuma longa Curcuma petiolata
Curcuma petiolata 'Emperor' Curcuma roscoeana
Curcuma roscoeana 'White Flame' Curcuma sumatrana
Curcuma thorellii Curcuma zedoaria
Cuscuta campestris Cuscuta granovii
Cussonia paniculata Cyanastrum cordifolium var. compactum
Cyathea cooperi Cycas circinalis
Cycas revoluta Cyclamen coum
Cyclamen hederifolium Cyclamen hederifolium 'Silver Form'
Cyclamen persicum Cyclamen persicum 'Carmen'
Cydista aequinoctialis Cydonia oblonga
Cymbidium x Cymbidium x 'Levis Duke Bella Vista'
Cymbidium x 'Mary Bea' Cymbopogon citratus
Cynara cardunculus Cynara scolymus
Cynara scolymus 'Imperial Star' Cynara scolymus 'Large Green Globe'