C
Last updated October 1, 2009
| Name | Family | Nativity |
| Caesalpinia cacalaco | Caesalpiniaceae | S Mexico |
| Caesalpinia sp. | Caesalpiniaceae | |
| Calamagrostis nutkaensis | Poaceae | Western United States |
| Calibanus hookeri | Nolinaceae | Mexico |
| Calibanus hybrid | Nolinaceae | |
| Calliandra sp. | Mimosaceae | |
| Callistemon citrinus cv. Jeffersii | Myrtaceae | Australia |
| Callistemon cv. Cane's Hybrid | Myrtaceae | |
| Callistemon cv. Little John | Myrtaceae | |
| Callistemon montanus | Myrtaceae | E Australia |
| Callistemon pinifolius | Myrtaceae | Australia(New South Wales) |
| Callistemon salignus | Myrtaceae | SE Australia |
| Callistemon speciosus | Myrtaceae | W Australia |
| Callitris rhomboidea | Cupressaceae | Australia |
| Calocedrus decurrens | Cupressaceae | Oregon to California |
| Calodendrum capense | Rutaceae | |
| Calpurnia aurea ssp. aurea | Fabaceae | South Africa |
| Camellia cv. Yume | Theaceae | |
| Camellia japonica cv. | Theaceae | |
| Camellia japonica cv. Bob Hope | Theaceae | |
| Camellia japonica cv. C.M. Wilson | Theaceae | |
| Camellia japonica cv. Calypso | Theaceae | |
| Camellia japonica cv. Chandler Elegans Variegated | Theaceae | |
| Camellia japonica cv. Colonel Fiery | Theaceae | |
| Camellia japonica cv. Daijohkan | Theaceae | |
| Camellia japonica cv. Daikhjan | Theaceae | |
| Camellia japonica cv. Debutante | Theaceae | |
| Camellia japonica cv. Debutante Benten | Theaceae | |
| Camellia japonica cv. Elegans | Theaceae | |
| Camellia japonica cv. Herme | Theaceae | |
| Camellia japonica cv. Kramer Supreme | Theaceae | |
| Camellia japonica cv. Magnoliaeflora | Theaceae | |
| Camellia japonica cv. Moonlight Sonata | Theaceae | |
| Camellia japonica cv. Mrs. Charles Cobb | Theaceae | |
| Camellia japonica cv. Mrs. D.W. Davis | Theaceae | |
| Camellia japonica cv. Nuccio's Pink Lace | ericacaea | |
| Camellia japonica cv. Pink Pagoda | Theaceae | |
| Camellia japonica cv. Shira Ogi | Theaceae | |
| Camellia japonica cv. Shiro Chan | Theaceae | |
| Camellia japonica cv. Zorina | Theaceae | |
| Camellia lutchuensis cv. Minato-No-Akebono | Theaceae | |
| Camellia lutchuensis cv. Minato-No-Haru | Theaceae | |
| Camellia lutchuensis cv. Tenju | Theaceae | |
| Camellia reticulata cv. Buddha | Theaceae | |
| Camellia reticulata cv. E.G. Waterhouse | Theaceae | |
| Camellia sasanqua cv. | Theaceae | |
| Camellia sasanqua cv. Choji Guruma | Theaceae | |
| Camellia sasanqua cv. Himekoki | Theaceae | |
| Camellia sasanqua cv. Showa-no-sakae | Theaceae | |
| Campanula poscharskyana | Campanulaceae | Europe |
| Campanula poscharskyana | Campanulaceae | N Yugoslavia |
| Campanula poscharskyana cv. Alba | Campanulaceae | Europe |
| Campylanthus salsoloides | Scrophulariaceae | Spain(Canary Islands) |
| Campyloneurum angustifolia | Polypodiaceae | Tropical America |
| Campyloneurum sp. | Polypodiaceae | |
| Campyloneurum xalapense | Polypodiaceae | Mexico |
| Canistrum cv. Leopardinum | Bromeliaceae | |
| Canistrum triangulare | Bromeliaceae | Brazil |
| Canistrum wendlandii | Bromeliaceae | |
| Canna cv. Pretoria | Cannaceae | |
| Canna hybrid | Cannaceae | |
| Canna x ehemanni | Cannaceae | |
| Canna x generalis cv. King Humbert | Cannaceae | |
| Cantua buxifolia | Polemoniaceae | Peru, Bolivia, N Chile |
| Capparis spinosa | Capparaceae | Greece |
| Carex albula | Cyperaceae | S Australia |
| Carex elata cv. Bowles Golden | Cyperaceae | |
| Carex glauca | Cyperaceae | Central Europe |
| Carex morrowii cv. Aurea-Variegata | Cyperaceae | |
| Carex muskingumensis | Cyperaceae | Central United States |
| Carex solandri | Cyperaceae | New Zealand |
| Carex spissa | Cyperaceae | California |
| Carica quercifolia | Caricaceae | South America |
| Carludovica palmata | Cyclanthaceae | Central and South America |
| Carnegeia gigantea | Cactaceae | United States, Mexico(Sonora) |
| Caryota mitis | Arecaceae | India to Philippines, Java |
| Caryota no | Arecaceae | Borneo |
| Caryota obtusa | Arecaceae | N India |
| Caryota ochlandra | Arecaceae | S China |
| Caryota rumphiana | Arecaceae | Australia, India, Philippines |
| Caryota sp | Arecaceae | Indonesia |
| Caryota sp. | Arecaceae | |
| Caryota urens | Arecaceae | |
| Caryota urens | Arecaceae | India, Sri Lanka, Malay Penn. |
| Cassia excelsa | Caesalpiniaceae | E Brazil |
| Castanea cv. Colossal | Fagaceae | |
| Casuarina cristata | Casuarinaceae | Australia |
| Casuarina equisetifolia | Casuarinaceae | Australia |
| Catalpa speciosa | Bignoniaceae | E United States |
| Cattleya cv. Sue Ozella | Orchidaceae | |
| Ceanothus arboreus | Rhamnaceae | |
| Ceanothus arboreus | Rhamnaceae | Channel Islands, CA |
| Ceanothus arboreus | Rhamnaceae | Is. off California coast |
| Ceanothus cuneatus | Rhamnaceae | Oregon to Baja, CA |
| Ceanothus cv. Centennial | Rhamnaceae | |
| Ceanothus cv. Concha | Rhamnaceae | |
| Ceanothus cv. Dark Star | Rhamnaceae | |
| Ceanothus cv. Ray Hartman | Rhamnaceae | |
| Ceanothus gloriosus cv. Anchor Bay | Rhamnaceae | |
| Ceanothus griseus v. horizontalis cv. Yankee Point | Rhamnaceae | |
| Ceanothus griseus v. horizontalis cv. Yankee Point | Rhamnaceae | California |
| Ceanothus impressus | Rhamnaceae | Coastal Cen California |
| Ceanothus spinosus | Rhamnaceae | California and Mexico |
| Ceanothus thyrsiflorus | Rhamnaceae | California to S Oregon |
| Ceaonthus cultivars | Rhamnaceae | |
| Cedrela sinensis | Meliaceae | China |
| Cedrus atlantica | Pinaceae | Algeria |
| Cedrus atlantica cv. Glauca | Pinaceae | |
| Cedrus atlantica cv. Glauca Pendula | Pinaceae | |
| Cedrus deodara | Pinaceae | Himalayas |
| Ceiba pentandra | Bombacaceae | Mexico |
| Centranthus ruber | Valerianaceae | Mediterranean |
| Cephalocereus senilis | Cactaceae | Mexico |
| Ceratophyllum demersum | Ceratophyllaceae | Worldwide |
| Ceratostigma plumbaginoides | Plumbaginaceae | W China |
| Ceratozamia beccarae | Zamiaceae | Mexico(Tabasco) |
| Ceratozamia hildae | Zamiaceae | Mexico |
| Ceratozamia kuesteriana | Zamiaceae | Mexico(Tamaulipas) |
| Ceratozamia latifolia | Zamiaceae | Mexico |
| Ceratozamia mexicana | Zamiaceae | Mexico |
| Ceratozamia microstrobila | Zamiaceae | Mexico |
| Ceratozamia microstrobila x sp. aff. mexicana | Zamiaceae | |
| Ceratozamia miqueliana | Zamiaceae | Mexico(Veracruz) |
| Ceratozamia miqueliana "Malpaso" | Zamiaceae | Mexico |
| Ceratozamia mixeorum | Zamiaceae | Mexico(Oaxaca) |
| Ceratozamia morettii | Zamiaceae | Mexico(Veracruz) |
| Ceratozamia norstogii | Zamiaceae | Mexico |
| Ceratozamia robusta | Zamiaceae | Mexico, Belize & Guatemala |
| Ceratozamia sabatoi | Zamiaceae | Mexico |
| Ceratozamia soconuscensis | Zamiaceae | Mexico(Chiapas) |
| Ceratozamia sp. | Zamiaceae | |
| Ceratozamia sp. nov. "Jalapa" | Zamiaceae | Mexico(Veracruz) |
| Ceratozamia sp. nov. "Naranjal" | Zamiaceae | Mexico(Veracruz) |
| Ceratozamia sp. nov. "Puerto Escondido" | Zamiaceae | Mexico |
| Ceratozamia sp. nov. "Xilitla" | Zamiaceae | |
| Ceratozamia whitelockiana | Zamiaceae | Mexico(Oaxaca) |
| Ceratozamia zaragozae | Zamiaceae | Mexico(San Luis Potosi) |
| Ceratozamia zoquorum | Zamiaceae | Mexico(Chiapas) |
| Cercidiphyllum japonicum | Cercidiphyllaceae | China, Japan |
| Cercidium cv. Desert Museum | Fabaceae | |
| Cercis occidentalis | Fabaceae | CA, AZ, UT |
| Cereus "labouritanus" | Cactaceae | |
| Cereus aethiops | Cactaceae | N. Argentina, S. Brazil |
| Cereus alacriportanus | Cactaceae | Brazil, Uruguay, Paraguay |
| Cereus cf. huntingtonianus | Cactaceae | |
| Cereus collosus | Cactaceae | Brazil |
| Cereus comarapanus | Cactaceae | Bolivia(Santa Cruz) |
| Cereus formosus | Cactaceae | Brazil |
| Cereus glaucus | Cactaceae | Unknown |
| Cereus hankeanus | Cactaceae | Argentina, Bolivia |
| Cereus hildmannianus | Cactaceae | Brazil, Arg., Paraguay, Urug. |
| Cereus huilunchu | Cactaceae | Bolivia(Cochabamba) |
| Cereus hybrid | Cactaceae | |
| Cereus hybrid f. monstrosus | Cactaceae | |
| Cereus jamacaru | Cactaceae | Brazil |
| Cereus jamacaru f. monstrosus | Cactaceae | Brazil |
| Cereus lamprospermus ssp. colosseus | Cactaceae | Bolivia |
| Cereus micropetalis | Cactaceae | Bolivia |
| Cereus peruvianus f. monstrosus | Cactaceae | SE South America |
| Cereus peruvianus v. persicinus | Cactaceae | |
| Cereus peruvianus v. reclinatus | Cactaceae | |
| Cereus repandus | Cactaceae | Venezuela, W Caribbean |
| Cereus sp. | Cactaceae | |
| Cereus sp. | Cactaceae | Bolivia |
| Cereus stenogonus | Cactaceae | Argentina, Paraguay |
| Cereus validus | Cactaceae | E Bolivia, Argentina |
| Cereus vargasianus | Cactaceae | Peru |
| Cereus variabilis | Cactaceae | Brazil |
| Cereus variabilis f. monstrosus | Cactaceae | Brazil |
| Ceropegia dichotoma | Asclepiadaceae | |
| Ceropegia dichotoma | Asclepiadaceae | Spain(Canary Islands) |
| Ceropegia fusca | Asclepiadaceae | Spain(Canary Islands) |
| Ceroxylon quindiuense | Arecaceae | Colombia |
| Cestrum elegans | Solanaceae | American Tropics |
| Chamaecyparis lawsoniana | Cupressaceae | SW California to NW Oregon |
| Chamaecyparis nidifera cv. Nestoides | Cupressaceae | |
| Chamaecyparis obtusa cv. Ericoides | Cupressaceae | |
| Chamaecyparis obtusa cv. Gracilis | Cupressaceae | |
| Chamaecyparis obtusa cv. Kosteri | Cupressaceae | |
| Chamaecyparis obtusa cv. Nana Gracilis | Cupressaceae | |
| Chamaecyparis obtusa cv. Reis Dwarf | Cupressaceae | |
| Chamaecyparis pisifera cv. Cyano-viridis | Cupressaceae | |
| Chamaecyparis sp. | Cupressaceae | |
| Chamaedorea allenii | Arecaceae | Panama |
| Chamaedorea alternans | Arecaceae | Mexico(Veracruz) |
| Chamaedorea arenbergiana | Arecaceae | Mexico to Guatemala & Honduras |
| Chamaedorea brachypoda | Arecaceae | Guatemala, Honduras |
| Chamaedorea carchensis | Arecaceae | Mexico, Guatemala |
| Chamaedorea cataractarum | Arecaceae | S Mexico |
| Chamaedorea costaricana | Arecaceae | Costa Rica, Nicaragua,Honduras |
| Chamaedorea cv. Irving Cantor | Arecaceae | |
| Chamaedorea elatior | Arecaceae | |
| Chamaedorea elatior | Arecaceae | Mexico, Guatemala |
| Chamaedorea elegans | Arecaceae | Mexico, Guatemala, Belize |
| Chamaedorea ernesti-augustii | Arecaceae | Belize |
| Chamaedorea ernesti-augustii | Arecaceae | Mexico to Honduras |
| Chamaedorea falcifera | Arecaceae | |
| Chamaedorea fragrans | Arecaceae | Peru |
| Chamaedorea geonomiformis | Arecaceae | Mexico to Honduras |
| Chamaedorea glaucifolia | Arecaceae | Mexico(Chiapas) |
| Chamaedorea hooperiana | Arecaceae | Mexico(Veracruz) |
| Chamaedorea klotzschiana | Arecaceae | Mexico(Veracruz) |
| Chamaedorea linearis | Arecaceae | Venezuela to Bolivia |
| Chamaedorea metallica | Arecaceae | Mexico |
| Chamaedorea microspadix | Arecaceae | Mexico |
| Chamaedorea nationsiana | Arecaceae | Guatemala |
| Chamaedorea neurochlamys | Arecaceae | S Mexico to Honduras |
| Chamaedorea nubium | Arecaceae | Mexico, Guatemala, El Salvador |
| Chamaedorea oblongata | Arecaceae | Mexico to Nicaragua |
| Chamaedorea pedunculata | Arecaceae | Costa Rica(Puntarenas) |
| Chamaedorea pinnatifrons | Arecaceae | Mexico to South America |
| Chamaedorea plumosa | Arecaceae | Mexico |
| Chamaedorea pochutlensis | Arecaceae | W Mexico |
| Chamaedorea quezallteca | Arecaceae | Mexico(Chiapas) to Honduras |
| Chamaedorea radicalis | Arecaceae | Mexico |
| Chamaedorea rhizomatosa | Arecaceae | Mexico(Oaxaca) |
| Chamaedorea rojasiana | Arecaceae | Mexico(Chiapas), Guatemala |
| Chamaedorea rossteniorum | Arecaceae | Costa Rica, Panama |
| Chamaedorea sartorii | Arecaceae | Mexico, Honduras |
| Chamaedorea schiedeana | Arecaceae | Mexico |
| Chamaedorea seifrizii | Arecaceae | S Mexico to Honduras |
| Chamaedorea sp. | Arecaceae | |
| Chamaedorea stolonifera | Arecaceae | Mexico(Chiapas) |
| Chamaedorea tenella | Arecaceae | Mexico, Costa Rica |
| Chamaedorea tepejilote | Arecaceae | SE Mexico to N Colombia |
| Chamaedorea warscewiczii | Arecaceae | Panama, Costa Rica |
| Chamaedorea woodsoniana | Arecaceae | Mexico, Cen America |
| Chamaerops humilis | Arecaceae | S Europe & N Africa |
| Chambeyronia macrocarpa | Arecaceae | New Caledonia |
| Chambeyronia sp. | Arecaceae | |
| Cheiridopsis candidissima | Aizoaceae | South Africa |
| Chilopsis linearis | Bignoniaceae | SW US to N Mexico |
| Chimonanthus praecox | Calycanthaceae | China |
| Chimonobambusa quadrangularis | Poaceae | China |
| Chlorophytum comosum cv. Variegatum | Liliaceae | |
| Chondropetalum elephantinum | Restionaceae | Africa |
| Chorisia speciosa | Bombacaceae | Argentina, Brazil |
| Chrysanthemum coccineum | Asteraceae | |
| Chrysanthemum paludosum | Asteraceae | W Mediterranean |
| Chusquea aff. culeou | Poaceae | Chile |
| Chusquea coronalis | Poaceae | Central America |
| Cibotium glaucum | Dicksoniaceae | Hawaii |
| Cibotium schiedei | Dicksoniaceae | Mexico, Guatemala |
| Cinnamomum camphora | Lauraceae | China, Taiwan, Japan |
| Cinnamomum zeylanicum | Lauraceae | India, Sri Lanka, Myanmar |
| Cipocereus sp. | Cactaceae | Brazil |
| Cissus tuberosa | Vitaceae | Mexico |
| Cistanthe grandiflora cv. Jazz Time | Portulacaceae | |
| Cistus cv. Sunset | Cistaceae | |
| Cistus salviifolius cv. Prostratus | Cistaceae | Europe |
| Cistus sp. | Cistaceae | |
| Citrus aurantifolia | Rutaceae | |
| Citrus aurantifolia cv. Bearss | Rutaceae | |
| Citrus junos | Rutaceae | Japan |
| Citrus limettioides | Rutaceae | India |
| Citrus limon | Rutaceae | |
| Citrus limon cv. Eureka | Rutaceae | |
| Citrus limon cv. Meyer | Rutaceae | |
| Citrus limon cv. Pink Lemonade | Rutaceae | |
| Citrus paradisi x maxima cv. Oroblanco | Rutaceae | |
| Citrus reticulata | Rutaceae | |
| Citrus reticulata cv. Dancy | Rutaceae | |
| Citrus reticulata cv. Pixie | Rutaceae | |
| Citrus reticulata cv. Satsuma | Rutaceae | |
| Citrus reticulata cv. Willowleaf | Rutaceae | |
| Citrus sinensis | Rutaceae | |
| Citrus sinensis cv. "Agua Tibia" | Rutaceae | |
| Citrus sinensis cv. Cara Cara | Rutaceae | |
| Citrus sinensis cv. Robertson | Rutaceae | |
| Citrus sinensis cv. Satsuma | Rutaceae | |
| Citrus x paradisi cv. Rio Red | Rutaceae | |
| Cleistocactus acanthurus | Cactaceae | Peru |
| Cleistocactus baumannii | Cactaceae | South America |
| Cleistocactus baumannii v. chacoanus | Cactaceae | Bolivia |
| Cleistocactus brookeae | Cactaceae | Bolivia |
| Cleistocactus buchtienii | Cactaceae | Bolivia |
| Cleistocactus ferrarii | Cactaceae | Argentina |
| Cleistocactus fieldianus | Cactaceae | Peru |
| Cleistocactus fieldianus ssp. tessallatus | Cactaceae | Peru |
| Cleistocactus hyalacanthus | Cactaceae | Argentina |
| Cleistocactus hybrid | Cactaceae | |
| Cleistocactus icosagonus | Cactaceae | S Ecuador, N Peru |
| Cleistocactus laniceps | Cactaceae | Bolivia |
| Cleistocactus micropetalus | Cactaceae | Peru |
| Cleistocactus morawetzianus | Cactaceae | Peru |
| Cleistocactus otoyensis | Cactaceae | |
| Cleistocactus palhuayensis | Cactaceae | Bolivia |
| Cleistocactus parviflorus | Cactaceae | Bolivia |
| Cleistocactus plagiostoma | Cactaceae | Peru |
| Cleistocactus ritteri | Cactaceae | Bolivia |
| Cleistocactus samaipatanus | Cactaceae | Bolivia, Peru |
| Cleistocactus sepium | Cactaceae | Ecuador |
| Cleistocactus sepium v. cristatum | Cactaceae | Ecuador |
| Cleistocactus smaragdiflorus | Cactaceae | Argentina, Bolivia, Paraguay |
| Cleistocactus sp. | Cactaceae | |
| Cleistocactus sucrensis v. tupizensis | Cactaceae | Bolivia |
| Cleistocactus tominensis | Cactaceae | Bolivia |
| Cleistocactus tupizensis | Cactaceae | Bolivia |
| Cleistocactus x Oreocereus hybrid | Cactaceae | |
| Clematis armandii | Ranunculaceae | Cen & W China |
| Clematis ligusticifolia | Ranunculaceae | W North America |
| Clerodendrum bungei | Verbenaceae | China |
| Clerodendrum trichotomum | Verbenaceae | Japan |
| Cleyera japonica | Theaceae | Japan and SE Asia |
| Clivia Belgian hybrids | Amaryllidaceae | South Africa |
| Clivia caulescens | Amaryllidaceae | South Africa |
| Clivia hybrid | Amaryllidaceae | |
| Clivia miniata | Amaryllidaceae | South Africa |
| Clusia rosea | Clusiaceae | Fla., Mex. to S.Am.,W. Indies |
| Clusia sp. | Clusiaceae | |
| Coccothrinax alta | Arecaceae | Puerto Rico, Virgin Islands |
| Coccothrinax crinita | Arecaceae | Cuba |
| Cocculus laurifolius | Menispermaceae | Himalayas |
| Cochemiea halei | Cactaceae | Mexico(Baja California) |
| Cochemiea poselgeri | Cactaceae | Mexico(Baja California Sur) |
| Cochlospermum vitifolium | Bixaceae | Tropical America |
| Coffea arabica | Rubiaceae | Ethiopia, Sudan |
| Coleonema album | Rutaceae | South Africa |
| Coleonema pulchrum | Rutaceae | South Africa |
| Coleus barbatus | Lamiaceae | South Africa |
| Coleus x hybridus cv. Kong | Lamiaceae | |
| Colocasia esculenta | Araceae | Tropical E Asia |
| Colocasia esculenta cv. | Araceae | |
| Colocasia esculenta cv. Black Magic | Araceae | |
| Colocasia esculenta cv. Fontanesii | Araceae | |
| Colocasia esculenta v. antiquorum | Araceae | India |
| Combretum erythrophyllum | Combretaceae | South Africa |
| Combretum fruticosum | Combretaceae | Mozambique |
| Combretum zeyheri | Combretaceae | SE Africa |
| Commiphora grandifolia | Vitaceae | Madagascar |
| Coniogramme japonica | Pteridaceae | China, Taiwan, Korea, Japan |
| Consolea moniliformis | Cactaceae | Cuba |
| Consolea nashii | Cactaceae | Bahamas, Cuba |
| Convolvulus cneorum | Convolvulaceae | Italy |
| Copernicia alba | Arecaceae | South America |
| Copiapoa cinerea | Cactaceae | Chile |
| Copiapoa coquimbana | Cactaceae | Chile |
| Copiapoa fiedleriana | Cactaceae | Chile(Atacama) |
| Copiapoa haseltoniana | Cactaceae | Chile |
| Copiapoa humilis | Cactaceae | N Chile |
| Copiapoa krainziana | Cactaceae | Chile |
| Copiapoa marginata | Cactaceae | Chile(Atacama) |
| Copiapoa montana | Cactaceae | N Chile |
| Copiapoa sp. | Cactaceae | |
| Copiapoa tenuissima | Cactaceae | Chile |
| Cordyline australis cv. Red Sensation | Agavaceae | |
| Cordyline rubra | Agavaceae | Cultivated orign |
| Cordyline sp. | Agavaceae | |
| Cordyline stricta | Agavaceae | Australia |
| Cordyline terminalis | Agavaceae | E Asia |
| Cordyline terminalis cv. Bolero Bicolor | Agavaceae | |
| Coreopsis basalis | Asteraceae | United States(Texas) |
| Coreopsis grandiflora | Asteraceae | E & S United States |
| Coreopsis grandiflora cv. Early Sunrise | Asteraceae | |
| Cornus florida | Cornaceae | |
| Cornus florida cv. Cloud Nine | Cornaceae | |
| Cornus sanguinea | Cornaceae | Europe |
| Corokia sp. | Cornaceae | |
| Correa cv. Dusky Bells | Rutaceae | |
| Correa cv. Ivory Bells | Rutaceae | |
| Correa pulchella | Rutaceae | Australia |
| Correa pulchella | Rutaceae | S Australia |
| Corryocactus apiciflorus | Cactaceae | Peru |
| Corryocactus pulquiensis | Cactaceae | Bolivia(Santa Cruz) |
| Corryocactus sp. | Cactaceae | |
| Corynocarpus laevigatus | Corynocarpaceae | New Zealand |
| Corynocarpus laevigatus cv. Variegata | Corynocarpaceae | |
| Coryphantha compacta | Cactaceae | Mexico |
| Coryphantha elephantidens | Cactaceae | Mexico (Michoacan) |
| Coryphantha radians | Cactaceae | Mexico |
| Cotoneaster dammeri cv. Lowfast | Rosaceae | |
| Cotoneaster lacteus | Rosaceae | China |
| Cotyledon adscendens | Crassulaceae | South Africa |
| Cotyledon orbiculata | Crassulaceae | South Africa |
| Cotyledon orbiculata v. flanaganii | Crassulaceae | South Africa(E. Cape Prov.) |
| Cotyledon sp. | Crassulaceae | |
| Cotyledon tomentosa ssp. ladismithiensis | Crassulaceae | South Africa |
| Cotyledon tomentosa ssp. tomentosa | Crassulaceae | South Africa |
| Cotyledon undulata | Crassulaceae | South Africa(E. Cape Province) |
| Cotyledon woodii f. | Crassulaceae | South Africa |
| Crassula alba cv. Rep-tiles | Crassulaceae | |
| Crassula arborescens | Crassulaceae | South Africa |
| Crassula arborescens ssp. undulatifolia | Crassulaceae | Mexico |
| Crassula argentea | Crassulaceae | Mexico |
| Crassula cv. Red Flame | Crassulaceae | |
| Crassula falcata | Crassulaceae | South Africa |
| Crassula multicava | Crassulaceae | E South Africa |
| Crassula orbicularis | Crassulaceae | South Africa |
| Crassula ovata | Crassulaceae | South Africa |
| Crassula ovata cv. Gollum | Crassulaceae | |
| Crassula perfoliata v. perfoliata | Crassulaceae | South Africa(E. Cape Prov.) |
| Crassula perforata | Crassulaceae | South Africa |
| Crassula phyturus | Crassulaceae | African Tropics |
| Crassula sarcocaulis | Crassulaceae | South Africa(Mpumulanga) |
| Crassula sp. | Crassulaceae | |
| Crassula sp. nov. "Matsikamma Mountains" | Crassulaceae | |
| Crassula streyi | Crassulaceae | South Africa(KwaZulu-Natal) |
| Crassula tetragona ssp. acutifolia | Crassulaceae | South Africa |
| Crataegus sp. | Rosaceae | |
| Crinum asiaticum cv. | Amaryllidaceae | |
| Crotalaria capensis | Papilionaceae | SE Africa |
| Croton sylvaticus | Euphorbiaceae | South Africa |
| Cryosophila sp. | Arecaceae | Mexico |
| Cryptanthus burle-marxii | Bromeliaceae | Brazil |
| Cryptanthus cv. Madame Ganna Walska | Bromeliaceae | |
| Cryptbergia rubra | Bromeliaceae | |
| Cryptomeria japonica | Taxodiaceae | Japan |
| Cryptomeria japonica cv. Elegans | Taxodiaceae | |
| Cryptomeria japonica v. sinensis | Taxodiaceae | |
| Ctenanthe sp. | Marantaceae | Brazil |
| Cunninghamia lanceolata | Taxodiaceae | China |
| Cuphea caeciliae | Lythraceae | Mexico |
| Cuphea micropetala | Lythraceae | Mexico |
| Cupressus cashmeriana | Cupressaceae | Kashmir, Tibet |
| Cupressus dupreziana | Cupressaceae | SE Algeria |
| Cupressus funebris | Cupressaceae | China, East Asia |
| Cupressus macrocarpa | Cupressaceae | California |
| Cupressus sempervirens | Cupressaceae | Europe and Asia |
| Curculigo capitulata | Hypoxidaceae | Asian Tropics, Polynesia |
| Cussonia paniculata | Araliaceae | South Africa |
| Cussonia spicata | Araliaceae | South Africa to Zambia |
| Cycas armstrongii | Cycadaceae | Australia(N. Territory) |
| Cycas cairnsiana forma nov. "Mt. Surprise" | Cycadaceae | |
| Cycas cf. rumphii | Cycadaceae | Indonesia |
| Cycas circinalis | Cycadaceae | Burma, India, Thailand |
| Cycas couttsiana | Cycadaceae | Australia(Queensland) |
| Cycas debaoensis | Cycadaceae | China |
| Cycas media | Cycadaceae | Australia(Queensland) |
| Cycas neo-caledonica | Cycadaceae | New Caledonia |
| Cycas revoluta | Cycadaceae | China,Japan,Japan(Ryukyu Is.) |
| Cycas riuminiana | Cycadaceae | Philippines(Luzon) |
| Cycas rumphii | Cycadaceae | Indonesia |
| Cycas schumanniana | Cycadaceae | Papua New Guinea |
| Cycas scratchleyana | Cycadaceae | Papua New Guinea |
| Cycas sp. | Cycadaceae | |
| Cycas sp. nov. "India" | Cycadaceae | India |
| Cycas sp. nov. "Malaysia" | Cycadaceae | NW Malaysia |
| Cycas sp. nov. "Petford Dwarf" | Cycadaceae | |
| Cycas taitungensis | Cycadaceae | Taiwan |
| Cycas taiwaniana | Cycadaceae | Taiwan, SE China |
| Cycas thouarsii | Cycadaceae | E. Africa & Indian Ocean Is. |
| Cycas wadei | Cycadaceae | Philippines(Culion) |
| Cycas yorkiana | Cycadaceae | Australia(Queensland) |
| Cymbalaria muralis | Scrophulariaceae | Europe |
| Cymbidium iridiodes | Orchidaceae | IndoChina |
| Cymbidium lowianum v. concolor | Orchidaceae | |
| Cyperus alternifolius | Cyperaceae | Madagascar |
| Cyperus papyrus | Cyperaceae | Tropical & N Africa |
| Cyperus textilis | Cyperaceae | |
| Cyphostemma juttae | Vitaceae | Namibia |
| Cyrtomium falcatum | Polypodiaceae | Asia, South Africa |
| Cyrtomium falcatum cv. Rochfordianum | Polypodiaceae |
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Ganna Walska died March 2, 1984, at Lotusland, leaving her garden and her entire estate to the Ganna Walska Lotusland Foundation, to insure that her legacy would remain in her gardens.