234 COMPOSITE. (COMPOSITE FAMILY.) 



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

 achenia smoothish, 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-angled, branch- 

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

 serrate or toothed ; the upper ones 3 - 5-cleft ; 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 twice as large as in the preceding. 



- - 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 5-6, 

 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 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, seemingly 6 in a whorl ; the divisions 

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

 oblong, united below : achenia oblong, narrowly ivinged, naked or minutely 2-toothed 

 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 

 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. delpllinifolia, 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, Ehrh., Ell.) Dry soil in the upper districts. Aug. and Sept. 

 Stem l-2high. 



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. 



