234 COMPOSITE. (COMPOSITE FAMILY.) 



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

 achenia Bmoothish, with two short triangular teeth. (C mitis, Michx. C. arguta, 

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



Stem 2° -4° high. Leaves polymorphous; the uppermost commonly undivided. 

 Rays showy. 



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

 ing; leaver pinnately 5-7-parted; the divisions lanceolate or linear, sharply 

 serrate or toothed; the upper ones 3 - 5-eleft ; exterior scales of the involucre 

 linear, obtuse; achenia hispid above, crowned with two triangular hispid teeth. 



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

 nia twiee as large as in the preceding. 



-i- h- Leaves petioled: achenia elliptical or allocate, emartjinate, a unless : exterior 

 scales of the involucre shorter than the interior. 



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

 ahove ; 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 hase ; 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 be- 

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

 exterior ones short, not muted below ; rays 4 - 5 ; achenia obovatc-oblong, 

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

 leaves 6' long. 



-i — -< — -« — Leaves sessile, 3-parted to the base, seeming!// 6 in a whorl ; the divisions 

 < nt in- or variously divided: scales of the involucre equal; the exterior ones linear* 

 oblong, united below: achenia oblong, narrowly winged, naked or minutely 2-ioothtd 

 at the apex. 



6. C. senifolia, 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. stcllata, Nult , with the stem more 

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

 and westward. Aug. — Stem 2° high. Leaves 1' - 2' long. Kays 6" - 9" 

 long. 



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

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



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

 verticillata, Ehrh , Ell.) —Dry Boil in the upper districts. Aug. and Sept.— 

 Stem l©_20 high. 



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

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

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

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



