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Scientific Name Common Name(s) Plant Category Image
Cirsium Cirsium, Plume thistle Annuals
Cirsium horridulum Yellow thistle Wildflowers
Cirsium muticum Swamp thistle Wildflowers
Cirsium pumilum Fragrant thistle, Pasture thistle Wildflowers
Cirsium vulgare Bull thistle, Common thistle Wildflowers
Cissus antarctica Kangaroo vine Vines
Cissus rhombifolia Grape leaf ivy, Oak leaf ivy Vines
Cladrastis kentukea Yellowwood Native Plants
Cladrastis lutea Yellowwood Native Plants, Trees
Clarkia hybrids Farwell to-spring, Godetia, Rocky Mountain garland Annuals
Claytonia caroliniana Broad-leaved spring beauty, Spring beauty Wildflowers
Clematis armandii Armand clematis, Evergreen clematis Poisonous Plants, Vines
Clematis crispa Curly clematis Poisonous Plants, Vines
Clematis hybrida Clematis, Hybrids Poisonous Plants, Vines
Clematis montana Anemone clematis, Indian's virgin's bower Poisonous Plants, Vines
Clematis paniculata Sweet autumn clematis Poisonous Plants, Vines
Clematis recta Clematis Poisonous Plants, Vines
Clematis spp. Clematis, Leather flower, virgin's bower Perennials, Poisonous Plants, Vines, Wildflowers
Clematis tangutica Golden clematis, Old man's beard clematis Poisonous Plants, Vines
Clematis texensis Scarlet clematis Poisonous Plants, Vines
Clematis viorna Leather flower Native Plants, Poisonous Plants, Vines
Clematis virginiana Italian clematis, Virgin's bower Native Plants, Poisonous Plants, Vines
Clematis viticella Italian clematis Poisonous Plants, Vines
Clematis x jackmanii Jackman clematis Poisonous Plants, Vines
Cleome hassleriana Cleome, Spider flower Annuals
Clerodendron trichotomum Harlequin glorybower Shrubs
Clerodendrum trichotomum 'Betty Stiles' Shrubs, Trees
Clerondendron ugandens Blue butterfly bush Annuals
Clethra acuminata Cinnamonbark clethra, Mountain pepperbush Native Plants, Shrubs
Clethra alnifolia Clethra, Summersweet, Sweet pepperbush Native Plants, Shrubs
Clethra alnifolia 'Crystalina' PP21,561 Shrubs
Clethra barbinervis Japanese clethra, Tree clethra Shrubs
Clethra fargesii Shrubs
Cliftonia monophylla Buckwheat tree, Titi Native Plants, Shrubs, Trees
Clintonia borealis Bluebead lily, Clinton's lily, Clintonia, Corn-lily, bluebead-lily Poisonous Plants, Wildflowers
Clintonia umbellulata Clinton's lily, Speckled wood lily, White clintonia Wildflowers
Clitoria mariana Butterfly pea Perennials, Vines, Wildflowers
Clitoria ternatea Blue pea, Butterfly pea Vines
Clivia Bush lily, Flame lily, Kaffir lily Summer Bulbs
Clivia miniata Clivia, Flame Lily, Kaffir Lily, September Lily Perennial Bulbs, Poisonous Plants
Cnidoscolus stimulosus Spurge nettle Poisonous Plants
Cobaena scandens Cathedral bells, Coral bells, Cup-and-saucer vine, Monastery bells Vines
Cocculus carolina Carolina moonseed, Coral-beads Native Plants, Vines
Codiaeum variegatum Croton Poisonous Plants
Coffea arabica Arabian coffee, Coffee plant Edible Plants, Shrubs, Trees
Coix lacryma-jobi Job's tears Ornamental Grass
Colchicum Autumn crocus, Meadow saffron, Mysteria, Wonder bulb Poisonous Plants, Summer Bulbs
Colchicum autumnale Fall Crocuses, Mysteria, Wonder Bulb Perennial Bulbs, Poisonous Plants
Colchicum spp. Autumn crocus, meadow saffron, naked ladies Poisonous Plants
Coleus pumilus Trailing coleus Annuals