211 COMl'OSITyK. (COMI'OSITK lAMII.V.) 



lohid, or all linear and entire ; exterior seales of the involucre linear-sputulatc ; 

 achenia sinootliish. with two short trian;;ular teeth. (C- niiti.s, Miclix. C. ar^utii, 

 Purs/i.) — Swamps, Florida to North Carolina, and westward. Aug. -Oct. — 

 Stem 2° -4° high. Loaves j)oi\inori)lious ; the uppermost eonimonly undivided. 

 Rays showy. 



3. C. tl'ichosperma, Miehx. Smooth; stem somewhat 4-an;,'le(l, hraneh- 

 ing; leaves pinnately 5-7-parted; the divisions laneeolate or linear, sharply 

 senate or toothed; the upper ones 3-5-cleft; exterior scales of the involucre 

 linear, ohtuse ; achenia his])id ahove, crowned with two triangular hispid teeth. 



— Swamps, South Carolina, and northward. Sept. — Stem 1° - 2° high. Acli«}- 

 nia twice as large as in the preceding. 



■I- -t- Leaves petioled: achenia elliptical or obovate, emarglnate, awiilcss : exterior 

 scales of the involucre shorter than the interior. 



4. C. tripteris, L. Stem smooth, branching ; leaves smooth, or rough 

 above ; the upper and lower ones entire, the middle ones 3- (rarely 5-) parted, 

 with the divisions lanceolate and entire ; exterior scales of the involucre 5-6, 

 obtuse, united at the base ; achenia elliptical, smooth, incurved, nanowly winged. 



— Woods and margins of fields, Florida to North Carolina, and westward. 

 Aug. and Sept. — Stem 3° - 6° high. 



5. C. latifolia, Michx. Smooth or somewhat pubescent ; stem tall ; leaves 

 undivided, ovate-oblong, acuminate, coarsely serrate, smooth above, paler be- 

 neath ; heads small, corymbose ; scales of the involucre 4 - 5 in each row ; the 

 exterior ones short, not united below ; rays 4 - 5 ; achenia obovate-oblong, 

 wingless. — High mountains of Georgia and North Carolina. Aug. — Lowest 

 leaves 6' long. 



-»-•»-■*- Leaves sessile, 3-parted to the base, seeminc/li/ 6 in a whorl; the divisions 

 entire or varioiisli/ divided: scales of the involucre equal ; the exterior ones liiiear- 

 oblontj, united below: achenia oblonej, narrowly winged, naked or minuteli/ 2-tooOud 

 at the apex. 



6. C. seuifolia, Michx. Pubescent; stem 4-angled below, branching ; di- 

 visions of the leaves oval-lanceolate, entire, the uppermost leaves often simple ; 

 disk yellow ; achenia minutely 2-toothed. (C. stellata, Nutt , with the stem more 

 slender and leaves narrower.) — Dry sandy woods, Florida to North Carolina, 

 and westward. Aug. — Stem 2° high. Leaves l'-2' long. Rays 6" -9" 

 long. 



7. C. delphiuifolia, Lam. Smooth or slightly pubescent; divisions of 

 the leaves entire or 2-3- (the middle one sometimes 5-) parted, linear-lanceolate, 

 rather rigid ; disk brownish ; achenia obovate-oblong, minutely 2-toothed. (C. 

 verticillata, .^A)7i,£//.) — Dry soil in the upper districts. Aug. and Sept.— 

 Stem l°-2° high. 



8. C. verticillata, L. Smooth ; stem branching, slender ; divisions of 

 the pinnately or bipinnately divided leaves linear or filiform ; disk yellow; ache- 

 nia minutely 2-toothed at the apex. (C. tenuifolia, Ell.) — Low ground, in the 

 upper districts. August. — Stem 1° - 3° high. 



