2o4: COMl'OSITyE. (COMTOSITE FAMILY.) 



lohcd, or all linear and entire ; exterior scales of the involucre linoar-spatulate ; 

 aclicnia sniootliish. with two short triangular teeth. (C- mitis, Michx. C. arguta, 

 Pursh.) — Swninps, Florida to North Carolina, and westward. Aug. -Oct. — 

 Stem 2° - 4° high. Leaves polymorphous ; tlie uppermost coinmonly uudivided. 

 Raj'S showy. 



3. C. trichosperma, Michx. Smooth ; stem somewhat 4-angled, branch- 

 ing; leaves pinnately 5-7-paited; the divihious lanceolate or linear, sharply 

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

 linear, ohtusc; acheuia hispid above, crowned with two triangular hispid teeth. 



— Swamps, South Carolina, and northward. Sept. — Stem 1° - 2° high. Aelie- 

 nia twice as large as in the preceding. 



t- •*- Leaves petioled: achenia elliptical or olmvate, emarginate, aionless : 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, narrowly 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 Ije- 

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

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

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

 leaves 6' long. 



-t- -i- -t- Leaves sessile, ^-parted to the Itase, srcmin(/li/ 6 in a u-horl ; the divisions 

 entire or variously divided: scales of the involucre cipial ; the exterior ones llnmi- 

 oblong, united below : achenia oblong, narrowly winged, nuked or minntelij 'i-toolhal 

 at the apex. 



6. C. senifolia, Michx. Pubescent; stem 4-angled Ix'low, branching ; di- 

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

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

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

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

 long. 



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

 the leaves ( iitirc or 2 -.'5- (the middle one sometimes 5-) jiarted, linear-lanceolate, 

 rather riL'id ; disk brownish ; achenia obovate-oblong, minutely 2-tooliied. (C. 

 v<Tti(illata, Ehrh , Ell.) —\)vy soil in the upper districts. Aug. and Sept. — 

 Stem l°-20 lii;;b. 



R. C. verticillata, L Smooth ; stem branching, sb-nder ; divisions of 

 the piniinfcly nr bipinnalely dividi'd leaves linear or filiform : di^k yellow ; ache- 

 nia minnt.-iy 2-tootli< d at the npex (C. tenuifolia, Kll.) — Low groniid, in tiie 

 ui)per districts. August. — Stem l°-30higti. 



