COMPOSURE, (composite family.) 24-9 



into a petiole ; disk roundish, purplish brown ; chaff of tlie receptacle acute, 

 hairy at the apex. — Dry soil. July -August. — Stem rigid, P-2° high. 

 Rays longer or shorter than the involucre. 



4. R. bicolor, Nutt. Hirsute; stem mostly simple, I'-l^' high; leaves 

 oblong, sessile, tlie lowest petioled ; heads small ; scales of the involucre 

 oblong ; rays yellow, the lower half browuisli purple. — Georgia. An immi- 

 grant from tlie West. 



5. R. fulgida, Ait. Pubescence hirsute, spreading ; stem mostly branch- 

 ing, 2° higli ; leaves narrowly or broadly lanceolate, tapering into a slender 

 petiole, slightly serrate, the upper sessile, or partly clas]uug ; heads loug- 

 peduncled ; disk globose, i' wide ; rays 10-14, lanceolate. — Dry woodlands. 

 August -Sept. 



6. R. spathulata, Michx. Pubescence .strigose, appressed ; stem l°-2° 

 high, often simple ; leaves generally broader, the lowest contracted into 

 broadly winged petioles ; heads smaller; rays fewer (6-8) and broader, 6"- 

 8" long. — (Jpeu woods in the upper districts. Augixst - Sept. - 



7. R. speciosa, Wenderoth. Hirsute; stem branching, 2*^-3° high; 

 leaves oblong-lanceolate, tapering at the base, serrate, and often coarsely 

 toothed, the earliest ovate, contracted into a long (6'- 10') slender petiole; 

 heads large, long-pedunded ; rays numerous, 1' long ; disk globose, dark 

 purple. — Rich soil in the upper districts. August -Sept. 



8. R. mollis, Ell. Stem villous, branching ; leaves oblong, obscurely 

 serrate, sessile and partly clasping, soft-tomeutose on both sides ; the lowest 

 somewhat spatulate ; scales of the involucre numerous, liuear-lauceolate, vil- 

 lous, reflexed, half as long as the (12 -20) rays; disk brownish ; chaff of the 

 receptacle rather obtuse, tomentose at the apex. — Dry soil, Plorida and 

 Georgia. August - Oct. — Stem 2° - 3° high. 



9. R. Heliopsidis, Torr. & Gray. Rhizoma prostrate ; stem pubescent, 

 with few peduncle-like branches at tlie summit ; leaves ovate or oval, slightly 

 serrate, obtuse, smoothish, 5-ribbed, petioled ; scales of the involucre oblong, 

 shorter than the brownish purple snbglobose disk, and (10- 12) oblong-linear 

 rays ; chaff of the receptacle obtuse, pubescent at tlie apex. Low ground in 

 tiie upper districts of Georgia and Alabama. August - Sept. — Stem 2° high. 



-1- H- Lriii-ps divided : stem panicnlutelij or corymhosehi hrunched. 



10. R. triloba, L. Biennial, rough-hairy ; stem much branclied ; lowest 

 leaves long petioled, ovate or oval, simple, or with two small lateral lobes, 

 .serrate; lower stem leaves 3-lobed ; the upper simple, sessile, often entire; 

 heads small, numerous; scales of the involucre narrow-lanceolate, shorter 

 than the rays ; disk almost black ; chaff 6f the receptacle awl-pointed, smooth, 

 as long as the flowers. — Dry ground along the mountains. August -Sept. 

 — Stem 2° - 4° high. 



Var. rupestris, Gray. Sj^arsely pubescent, stout ; lower leaves 3-parted ; 

 heads globular, f wide, rays orange-yellow. — High mountains of North 

 Carolina. 



Var. pinnatiloba, Torr. & Gray. More slender; lower leaves mostly 

 pinnately .5 - 7-lobed ; involucral scales linear, acute. — Dry woods, Mariana, 

 West Florida. August. 



