COMPOSITE. (COMPOSITE FAMILY.) 257 



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

 achenia Hat, obovate, the thin margins hispid ; awns slender, spreading, about 

 the leugth of the achenia Low thickets, Mississippi, and westward. Sept. 



*- <- Leaves petioled : uchen'u elliptical or obocate, emarginate, awnless: exte- 

 rior scu/is <>f tin- involucre shorter titan 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, smooth, incurved, narrowly winged. Woods 

 and margins of fields. August-Sept. Stem 3-6 high. 



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

 leaves undivided, ovare-oblong, acuminate, 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 ; acheiiia obovate- 

 obloiig, wingless. High mountains of Georgia and Jxorth Carolina. August. 



Lowest leaves 6' long. 



- -t- -i- Leu res sessile, 3-j>arted to the base, seemingly 6 in a whorl ; the divisions 

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

 oblong, united below: uclienia oblong, narrowly winged, truncate, or minutely 

 2-too.hcc/ nt the tijiex. 



7. C. seilifolia, Michx. Pubescent; stem 4 angled lelow, branching; 

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

 ple ; disk yellow ; achenia minutely 2-toothe,l. (C. stellata, JVutt., a glabrous 

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



Dry sandy woods. August. Stem 2 high. Leaves 1'- 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 2-toothed. 



- Dry soil in the upper districts. August -Sept. Stem l-2high. 



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

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

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

 August. Stem 1-. 3 high. 



* * * Rai/s 3 - 5-toothed or lobed. 



*- Rays yellow: achenia orbicular, broadl if winqed, icarty, and with a tubercle at 

 each end on the inside, 2-toothed: scales of the involucre near/.// equal: heails 

 lony-peduncled. 



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

 villous, 1 -2-forking; lower leaves ovate or roundish (li'-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), mostly 3- 

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



