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| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Latin Names | Common Names | Families |
| Caladium X hortulanum | Fancy-Leaved Caladium | Araceae |
| Calamagrostis brachytricha | Fall Blooming Reed | Poaceae |
| Calendula officinalis | Pot Marigold | Asteraceae |
| Calla palustris | Water Arum | Araceae |
| Callicarpa dichotoma | Beautyberry | Lamiaceae |
| Calycanthus floridus | Carolina Allspice | Calycanthaceae |
| Campanula carpatica | Tussock Bellflower | Campanulaceae+Lobeliaceae |
| Campanula lactiflora | Milky Bellflower | Campanulaceae+Lobeliaceae |
| Canna indica | Indian Shot | Cannaceae |
| Canna X generalis | Common Garden Canna | Cannaceae |
| Capsicum annuum | Red, Green, Chili Peppers | Solanaceae |
| Carex spp. | Sedge | Cyperaceae |
| Carpinus betulus | Eupropean Hornbeam | Betulaceae |
| Catharanthus roseus | Rose Periwinkle | Apocynaceae+Asclepiadaceae |
| Caulophyllum thalictroides | Blue Cohosh | Berberidaceae |
| Ceanothus americanus | New Jersey Tea | Rhamnaceae |
| Celosia cristata | Cockscomb & Feathered Amaranth | Amaranthaceae+Chenopodiaceae |
| Celtis occidentalis | Common Hackberry | Celtidaceae+Cannabinaceae |
| Centaurea montana | Mountain Bluet | Asteraceae |
| Centranthus ruber | Red Valerian | Dipsaccaceae+Valerianaceae + |
| Cephalanthus occidentalis | Buttonbush | Rubiaceae |
| Cerastium tomentosum | Snow-In-Summer | Caryophyllaceae |
| Cercidiphyllum japonicum | Katsura Tree | Cercidiphyllaceae |
| Cercis canadensis | Redbud | Fabaceae |
| Chamaedorea elegans | Parlor Palm | Arecaceae |
| Chasmanthium latifolium | Wild Oat | Poaceae |
| Chelone lyonii | Turtlehead | Veronicaceae+Plantaginaceae |
| Chimonanthus virginicus | Fringetree | Oleaceae |
| Cimicifuga racemosa | Black Snakeroot | Ranunculaceae |
| Clematis heracleifolia | Chinese Clematis | Ranunculaceae |
| Clematis integrifolia | Solitary Clematis | Ranunculaceae |
| Clematis recta | Upright Clematis | Ranunculaceae |
| Cleome hassleriana | Spider Flower | Cleomaceae |
| Clethra alnifolia | Sweet Pepper Bush | Clethraceae |
| Colchicum autumnale | Autumn Crocus | Colchicaceae+Uvulariaceae |
| Convallaria majalis | Lily-of-the-Valley | Ruscaceae+Convallariaceae |
| Coreopsis verticillata | Thread Leaf Tickseed | Asteraceae |
| Cornus alternifolia | Pagoda Dogwood | Cornaceae+Nyssaceae |
| Cornus canadensis | Bunchberry | Cornaceae+Nyssaceae |
| Corydalis lutea | Yellow Corydalis | Ranunculaceae |
| Cosmos bipinnatus | Cutleaf Cosmos | Asteraceae |
| Cosmos sulphureus | Yellow Cosmos | Asteraceae |
| Crinum americanum | Swamp Lily | Amaryllidaceae |
| Crocus tomasinianus | Crocus | Iridaceae |
| Cucurbita pepo | Summer Squash | Cucurbitaceae |
| Cuphea ignea | Cigar flower | Lythraceae+Punicaceae |
| Cyperus alternifolius | Umbrella Sedge | Cyperaceae |