2u4 COMPOSITE. (composite family.) 



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

 achenia smoothish, with two sliort triangular teeth. (C mitis, Michx. C. arguta, 

 Purslt.) — Swamps, Florida to North Carolina, ami westward. Aug. -Oct. — 

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

 Kays showy. 



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

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

 scrrate or toothed ; the upper ones 3 - 5-clcft ; exterior scales of the involucre 

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



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

 nia twice as large as in the preceding. 



-i- -t- Leaves petioled: achenia elliptical or obovate, emarginate, awnless : 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-G, 

 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 l>c- 

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

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

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

 leaves 6' long. 



-t- -t- -t- Leaves sessile, 3-parted to the base, seemingly 6 in a ichorl ; the divisions 

 entire or variously divided: scales of the involucre equal; the exterior ones linear- 

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

 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. stellata, Nutt , with the stem more 

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

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

 long. 



7. C. delphitlifolia, 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-toothed. (C. 

 vertieiiiata, Ehrh, Ell.)— Dry soil in the npper districts. Aug. and Sept — 

 Stem i°-2° high. 



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

 the pinnately or bipinnately divided haves Linear or filiform ; disk yellow; ache- 

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

 npper districts. August, — Stem i°-3°high. 



