COMPOSITE. (composite FAMILY.) 257 



4. C. aristosa, Michx. Like the last, but more or less pubescent; 

 acheuiii Hat, obovate, the thin margius liispid ; awns slender, spreading, about 

 the leijgtii of the acheuia — Low thickets, Mississippi, and westward. Sept. 

 •<- -I- Leaves pet ioled : uchenia elliptical or obovate, emarfjlnate, aivnless : exte- 

 rior scales of the involucre shorter than the interior. 



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

 above; rarely all entire, the middle ones 3- (rarely 5-) parted, with the divis- 

 ions lanceolate and entire ; exterior scales of the involucre 5-6, obtuse, united 

 at the base; achenia elliptical, smootii, incurved, narrowly winged. — Woods 

 and margius of fields. August - Sept. — Stem 3°- 6° high. 



6. C. latifolia, Michx. Smooth or somewliat pubescent ; stem tall ; 

 leaves undivided, ovate-oblong, acumiuate, coarsely serrate, smooth above, 

 paler beneath ; 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. August. 



— Lowest leaves 6' loug. 



■^ -I- ■<- Leaves sessile, 3-parted to the base, seeminr/ly 6 in a whorl ; the divisions 

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

 oblong, united below: achenia oblong, narrowly winged, truncate, or minutelij 

 2-toothed at the ujiex. 



7. C. senifolia, Michx. Pubescent; stem 4 angled below, branching; 

 divisions of the leaves oval-lanceolate, entire, the uppermost leaves often sim- 

 ple ; disk yellow ; achenia minutely 2-toothed. (C. stellata, Nutt., a glabrous 

 form, with broader thinner leaves. C. vEmleri, Ell., with all the leaves entire.) 



— Dry sandy woods. August. — -Stem 2° high. Leaves T - 2' long. Kays 

 6" -9" long. 



8.- C. delphinifolia, Lam. Smooth or slightly pubescent ; divisions 

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

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



— Dry soil in tlie upper districts. August -Sept. — Stem l°-2'' high. 



9. C. vertieillata, L. Smooth; stem branching, slender; divisions of 

 the pinnately or liipinnately divided leaves linear or filiform ; disk yellow ; 

 achenia minutely 2-toothed at the apex. — Low ground, in the upper districts. 

 August. — Stem l°-3° high. 



* * * Rays 3 - ^-toothed or lobed. 

 •^ Rays yellow : achenia orbicular, broadly winged, warty, and ivith a tubercle at 

 each end on the inside, 2-toothed: scales of the involucre nearly equal: heads 

 lony-peduncled. 



10. C. auriculata, L. Stem short (4' -8' high), smooth or sparsely 

 villous, 1 -2-forking ; lower leaves ovate or roundish (\V -2' long), entire, or 

 with 2-4 small lateral lobes, the others small and remote; heads few; 

 achenia oblong, incurved, wingless, even, or obscurely papillose. — Woods in 

 the upper districts. April -May. 



11. C. pubescens, Ell. Stem tall (2° high), densely villous, at length 

 much branched; lower leaves lanceolate or oblong (3' -4' long), mosth' 3- 

 lobed, as long as the stout petiole, the uppermost entire ; heads very numer- 



17 



