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Choose one of the letters above to browse the genera beginning with that letter. Cabomba Cacalia Cakile Calamagrostis Calamovilfa Callicarpa Callirhoe Callitriche Calopogon Caltha Calycocarpum Calylophus Calystegia Camassia Camelina Campanula Campsis Camptosorus Cannabis Capsella Caragana Cardamine Cardaria Cardiospermum Carduus Carex Carpinus Carum Carya Caryopteris Cassia Castanea Castilleja Catalpa Caulophyllum Ceanothus Celastrus Celtis Cenchrus Centaurea Centaurium Centunculus Cephalanthus Cerastium Ceratophyllum Cercis Chaenorhinum Chaerophyllum Chamaecrista Chamaedaphne Chasmanthium Cheilanthes Chelidonium Chelone Chenopodium Chimaphila Chionanthus Chloris Chorispora Chrysanthemum Chrysopsis Cichorium Cicuta Cimicifuga Cinna Circaea Cirsium Citrullus Cladium Cladrastis Claytonia Clematis Cleome Clintonia Clitoria Cocculus Coix Collinsia Collinsonia Collomia Comandra Commelina Comptonia Conioselinum Conium Conopholis Conringia Convallaria Convolvulus Conyza Corallorhiza Coreopsis Corispermum Cornus Coronilla Coronopus Corydalis Corylus Cosmos Cotinus Cotoneaster Crataegus Crepis Crotalaria Croton Crotonopsis Crypsis Cryptogramma Cryptotaenia Cucurbita Cunila Cuphea Cuscuta Cycloloma Cymbalaria Cynanchum Cynodon Cynoglossum Cyperus Cypripedium Cystopteris
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