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Scientific Name Common Name(s) Plant Category Image
Chionanthus retusus Chinese fringetree Trees
Chionanthus virginicus Fringe tree, Old man's beard Native Plants, Shrubs, Trees
Chionodoxa luciliae, C. gigantea Glory of the Snow Perennial Bulbs, Spring Bulbs
Chlidanthus Delicate lily, Perfumed fairy lily Summer Bulbs
Chlorophyllum molybdites Green Gill, Green-Spored Parasol Poisonous Plants
Chlorophytum comosum Spiderplant Perennials
Choisya ternata Mexican orange Shrubs
Chrysanthemum morifolium Chrysanthemum Perennials
Chrysanthemum X morifolium (Dendranthema X grandiflorum) Garden chrysanthemum, mum Poisonous Plants
Chrysogonum virginianum Green and gold Groundcover, Native Plants, Perennials, Wildflowers
Chrysogonum virginianum var. brevistolon Goldenstar, Green and gold Groundcover, Native Plants, Perennials
Chrysopsis mariana Maryland aster Wildflowers
Cichorium intybus Chicory Edible Plants, Wildflowers
Cicuta maculata Water hemlock, spotted cowbane, spotted water hemlock Poisonous Plants, Wildflowers
Cimicifuga americana American bugbane, Black snakeroot Wildflowers
Cimicifuga racemosa Black cohosh, Black snakeroot Wildflowers
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' 'Betty Stiles' Harlequin Glorybower Shrubs, Trees
Clerondendron ugandens Blue butterfly bush Annuals
Clethra acuminata Cinnamonbark clethra, Mountain pepperbush Native Plants, Shrubs, Trees
Clethra alnifolia Clethra, Summersweet, Sweet pepperbush Native Plants, Shrubs
Clethra alnifolia 'Crystalina' PP21,561 Summersweet, Summersweet clethra, 'Crystalina' Summersweet Clethra Shrubs
Clethra barbinervis Japanese clethra, Tree clethra Shrubs
Clethra fargesii Shrubs
Cliftonia monophylla Buckwheat tree, Titi Native Plants, Shrubs, Trees