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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