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| scientific name | common name(s) | image gallery |
| Betula populifolia | Gray birch White birch Aspen-leaved birch | |
| Bidens coronata | Crowned beggarticks | |
| Blephilia ciliata | Downy pagoda plant Sunny woodmint Ohio horsemint | |
| Carya alba | Mockernut hickory Big bud hickory | |
| Campanulastrum americanum | American bellflower American-bellflower Tall bellflower | |
| Callicarpa americana | American beautyberry French mulberry | |
| Carpinus caroliniana | American hornbeam Blue beech Musclewood Ironwood | |
| Cardamine concatenata | Cutleaf toothwort Pepper root | |
| Castanea dentata | American chestnut | |
| Cardamine diphylla | Crinkleroot Two-leaved toothwort Two-leaf toothwort | |
| Calycanthus floridus | Eastern sweetshrub Carolina allspice Sweet shrub | |
| Carya glabra | Pignut hickory | |
| Carex grayi | Gray's sedge | |
| Carya ovata | Shagbark hickory | |
| Caltha palustris | Yellow marsh marigold Yellow marsh-marigold Cowslip | |
| Carex pensylvanica | Pennsylvania sedge | |
| Carex plantaginea | Plantainleaf sedge Plantain-leaf sedge | |
| Castanea pumila | Chinkapin Allegheny chinquapin Allegheny-chinkapin Chinquapin | |
| Campsis radicans | Trumpet creeper Trumpet vine Common trumpet creeper Cow vine | |
| Camassia scilloides | Atlantic camas Wild hyacinth | |
| Catalpa speciosa | Northern catalpa Catawba tree Cigar tree Indian bean | |
| Caulophyllum thalictroides | Blue cohosh Squaw-root Papoose-root Caulophylle faux-pigamon | |
| Ceanothus americanus | New Jersey tea Redroot | |
| Cercis canadensis | Eastern redbud Redbud | |
| Celtis occidentalis | Common hackberry Nettle tree | |
| Cephalanthus occidentalis | Common buttonbush Buttonbush Button willow | |
| Chelone glabra | White turtlehead | |
| Chasmanthium latifolium | Inland sea oats Indian wood oats Wild oats River oats Flathead oats Upland Oats Upland Sea Oats | |
| Chamaelirium luteum | Blazing star Fairywand | |
| Chelone lyonii | Pink turtlehead | |
| Chamaecyparis thyoides | Atlantic white cedar Atlantic white-cedar | |
| Chionanthus virginicus | White fringetree Fringe tree Grancy Graybeard | |
| Chrysogonum virginianum | Green and gold Green-and-gold | |
| Clethra acuminata | Mountain sweet pepperbush Cinnamon clethra | |
| Clethra alnifolia | Coastal sweet pepperbush Clethra Summer sweet | |
| Claytonia caroliniana | Carolina springbeauty | |
| Cladrastis kentukea | Kentucky yellowwood Yellowwood Gopherwood Virgilia | |
| Clintonia umbellulata | White clintonia White bluebead-lily | |
| Claytonia virginica | Virginia springbeauty Springbeauty | |
| Clematis virginiana | Devil's darning needles Virgin's Bower Old Man's Beard | |
| Cornus alternifolia | Alternateleaf dogwood Alternate-leaf dogwood Pagoda dogwood | |
| Cornus amomum | Silky dogwood Red willow Silky cornel | |
| Corylus americana | American hazelnut American filbert | |
| Collinsonia canadensis | Citronella horsebalm Richweed Stoneroot | |
| Conoclinium coelestinum | Blue mistflower | |
| Cornus florida | Flowering dogwood Virginia dogwood | |
| Convallaria majuscula | American lily of the valley American lily-of-the-valley | |
| Cotinus obovatus | American smoke tree Smoke tree Texas smoke tree Chittamwood | |
| Comptonia peregrina | Sweet fern Sweet-fern | |
| Cornus racemosa | Gray dogwood | |
| scientific name | common name(s) | image gallery |