Carya aquatica Carya carolinae septentrionalis
Carya cordiformis Carya glabra
Carya illinoinensis Carya laciniosa
Carya ovata Carya ovata 'Grainger'
Carya ovata var. pubescens Carya tomentosa
Caryopteris 'Grand Bleu' Caryopteris x clandonensis
Caryopteris x clandonensis 'Arthur J. Simmonds' Caryopteris x clandonensis 'Blue Knoll'
Caryopteris x clandonensis 'Dark Knight' Caryopteris x clandonensis 'First Choice'
Caryopteris x clandonensis 'Heavenly Blue' Caryopteris x clandonensis 'Janice (Lil Miss Sunshine™)'
Caryopteris x clandonensis 'Kew Blue' Caryopteris x clandonensis 'Longwood Blue'
Caryopteris x clandonensis 'Minibleu(Petit Bleu™)' Caryopteris x clandonensis 'Worcester Gold'
Caryopteris divaricata 'Snow Fairy' Caryopteris incana
Caryopteris incana 'Jason(Sunshine Blue®)' Caryota mitis
Caryota rumphiana Caryota spp.
Caryota urens Casasia clusiifolia
Cassia bahamensis Cassia brewsteri
Cassia brewsteri var. marksiana Cassia eremophila
Cassia fistula Cassia fistula x javanica
Cassia javanica Cassia leptophylla
Cassia roxburghii Cassine guadrangulata
Cassine papillosa Cassiope mertensiana ssp. californica
Cassipourea verticillata Castanea dentata
Castanea mollissima Castanea pumila
Castanea sativa Castanea sativa 'Variegata'
Castanea spp. Castanopsis cuspidata var. sieboldii 'Angyo Yellow'
Castanospermum australe Castilleja californica
Casuarina equisetifolia Casuarina glauca
Casuarina monolifera Casuarina spp.
Catalpa bignonioides Catalpa bignonioides 'Aurea'
Catalpa bignonioides 'Nana' Catalpa bungei
Catalpa fargesii Catalpa ovata
Catalpa speciosa Catalpa speciosa 'Aurea'
Catalpa speciosa 'Pulveralenta' Catalpa spp.
Catananche caerulea Catananche caerulea 'Cupid's Dart'
Catharanthus roseus Catharanthus roseus 'First Kiss Blueberry'
Catharanthus roseus 'Jaio Dark Red' Catharanthus roseus 'Jaio Scarlet Eye'
Catharanthus roseus 'Parasol' Catharanthus roseus 'Pastels Mix'
Catharanthus roseus 'Pretty in Rose' Catharanthus roseus 'Raspberry Cooler'
Catharanthus roseus 'Rose Carpet' Catharanthus roseus 'Stardust Mix'
Catharanthus roseus 'Stardust Orchid' Cattleya x
Cattleya x 'Kodama' Cattleya x 'Luteus Forb'
Cattleya maxima