Cinna arundinacea (wood reedgrass) Poaceae 719 -- infl big w/ many branches, us spreading or drooping; denser infl; woods
Cinna latifolia (drooping wood reedgrass) Poaceae 719 -- infl less dense; woods
Circaea alpina (alpine evening nightshade) Onagraceae (2 2 2 1 epi) 303 -- lvs opp, petiolate
Circaea lutetiana (enchanter's nightshade) Onagraceae (2 2 2 1 epi) 303 -- lvs opp, petiolate
Cirsium altissimum (tall thistle) 581 -- lvs white under, merely toothed
Cirsium arvense (Canada thistle) 583 -- fl heads 1" or less high
Cirsium discolor (field thistle) 582 -- lvs white under & deeply cut
Cirsium flodmanii (purple thistle) 582 --
Cirsium horridulum (yellow thistle) 580 --
Cirsium muticum (swamp thistle) 583 -- base of fl head cobwebby w/ fine white hairs
Cirsium palustre (marsh thistle) 583 --
Cirsium pumilum (pasture thistle) 581 --
Cirsium sp. (thistle) Asteraceae/Cynareae --
Cirsium undulatum (wavy-leaved thistle) 582 --
Cirsium vulgare (bull thistle) 581 - lf green under; prickles on stem
Cistaceae (rock rose) -- Helianthemum (frostweed); Hudsonia (false heather); Lechea (pinweed)
Cladium mariscoides (twig rush) Cyperaceae 650 -- stems stiff, slender to 1m; infl brown, terminal cyme
Claytonia virginica (spring beauty) Portulacaceae (5 2 5 1) 099 --
Cleistes divaricata (spreading pognonia) Orchidaceae (2+1z 3 1-2 3) 823 -- pink fl tube-shaped w 3 brownish sep above fl; AE single mid-stem lf
Clematis occidentalis (western clematis) Ranunculaceae (0 4 N N) 051 --dull purple/purplish blue; ATD tri, sl toothed or entire
Clematis ochroleuca (yellowish-white clematis) Ranunculaceae (0 4 N N) 051 -- yellowish-white fls
Clematis orientalis (oriental clematis) Ranunculaceae (0 4 N N) 051 -- yellow & green
Clematis terniflora (yam-leaved clematis) Ranunculaceae (0 4 N N) 051 -- white; ODE trifoliate, ellip
Clematis virginiana (virgin's bower) Ranunculaceae (0 4 N N) 051 -- white; OTD trifoliate, coarsely toothed Clerodendrum japonicum Verbenaceae ((5) (5) 2+2 1 hypo) 407 --
Clethra alnifolia (sweet pepperbush) Clethraceae (5 5 5+5 1) 183 --
Clintonia borealis (bead lily) Liliaceae (3 3 6 3) 797
Clitoria mariana (butterfly pea) Fabaceae (5 5 10 1 perf or unisex; peri) 285 --
Clusiaceae (mangosteen) -- Hypericum (st john's wort); Triadenum (marsh st. john's wort)
Cnicus benedictus (blessed thistle) Asteraceae/Cynareae 586 --
Colchicum autumnale Liliaceae (3 3 6 3) 794 --
Collinsonia canadensis (horsebalm) Lamiaceae ((5) (5) 2 1) 418 -- lt yellow, lower lip fringed; OT coarsely toothed, citronella-scented
Comandra umbellata (bastard toad flax) Santalaceae (5 t 5 1 perf or unisex; epi) 306 -- greenish-white; AE oblong
Commelina communis (Asiatic dayflower) Commeliniaceae ( 3 3 3+3 3) 620 -- lower pet white; lvs lance-ovate
Commelina erecta (erect dayflower) Commeliniaceae ( 3 3 3+3 3) 621 -- lower pet white; lvs linear to lanceolate; dry, us sandy soil
Commelina virginica (Virginia dayflower) Commeliniaceae ( 3 3 3+3 3) 621 -- lower pet blue
Commelinaceae (spiderwort) -- Commelina (dayflower), Tradescantia (spiderwort)
Comptonia peregrina (sweet fern) Myricaceae 075
Conioselinum chinense (hemlock parsley) Apiaceae (5 5 5 2) 355 --
Conium maculatum (poison hemlock) Apiaceae (5 5 5 2) 351 -- bracts beneath white umbel entire; stem smooth, spotted; waste pls.
Conopholis americana (squawroot) Orobanchaceae ((5) (2-5) 2+2 1) 459 -- yllwish fls bet overlapping brown scales; resembling pine cone: NONE
Conringia orientalis (hare's-ear mustard) Brassicaceae (4 4 4+2 1) 164
Convallaria majalis (lily of the valley) Liliaceae (3 3 6 3) 800
Convolvulaceae (morning glory) -- Calystegia, Convolvulus, Ipomoea
Convolvulus arvensis (field bindweed) Convolvulaceae ((5) 5 5 1) 384 -- fls white or pink; lvs us arrow-shaped at base
Conyza canadensis (horseweed) Asteraceae/Astereae 561 -- white or sometimes pinkish; AE linear
Conyza ramosissima (horseweed) Asteraceae/Astereae 561 -- rays minute, purplish; AE linear
Coptis trifolia (goldthread) Ranunculaceae (0 4-7 N 3-7) 061 -- white fls; BDT like strawberry; moist woods & bogs
Corallorhiza maculata (large coralroot) Orchidaceae (2+1z 3 1-2 3) 827 -- brownish or purplish stem; pair of side lobes; NONE
Corallorhiza odontorhiza (late corralroot) Orchidaceae (2+1z 3 1-2 3) 827 -- brownish or purplish stem; fls late summer & fall; NONE
Corallorhiza trifida (early coralroot) Orchidaceae (2+1z 3 1-2 3) 827 -- yellowish stem; pair of side lobes; NONE
Corallorhiza wisteriana (wister's coralroot) Orchidaceae (2+1z 3 1-2 3) 827 -- purplish stem; fls spring to midsummer; NONE
Corema conradii (broom crowberry) Empetraceae (0 3-4 2 1) 184 --
Coreopsis pubescens (hairy tickseed) Asteraceae/Heliantheae 503
Coreopsis rosea (pink tickseed) Asteraceae/Heliantheae 505
Coreopsis tripteris (tall tickseed) Asteraceae/Heliantheae 504 -- ODE 3-5 lflts
Coriandrum sativum (coriander) Apiaceae (5 5 5 2) 349 --
Corispermum hyssopifolium (hyssop-leaved bugseed) Chenopodiaceae (0 2 1-3 2 sup) 090 --
Corispermum nitidum (bugseed) Chenopodiaceae (0 2 1-3 2 sup) 098 --
Cornaceae (dogwood) -- Cornus, Nyssa (tupelo)
Cornus alternifolia (alternate-leaved dogwood) Cornaceae (4 4 4 1 epi) 304 -- nearly horizontal greenish branches; fr bluish-black
Cornus amomum (swamp or silky dogwood) Cornaceae (4 4 4 1 epi) 304 -- fl stalks w/ silky hairs; fr blue; twigs becoming maroon
Cornus amomum var schuetzeana (pale dogwood) Cornaceae (4 4 4 1 epi) 304 -- lvs taper at both ends & pale beneath
Cornus canadensis (bunch flower dogwood) Cornaceae (4 4 4 1 epi) 305 --
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