COMPOSITAE (composite FA.AriLY) 789 



Mostly simple ; leaves tliin, elongate-lanceolate, all much exceeding the very 

 small axillary clusters. — N. S. to Que., Ont., and south w. Var. paxiculXta 

 Gray. Paniculately branched ; leaves smaller ; heads densely racemose-pani- 

 cled. — Kich woods and clearings, from s. Me. south w^. 



= = Ste^n angled^ not glaucous. 



4. S. latifolia L. Smooth or nearly so ; stem zigzag., simple or paniculate- 

 branched, 0.3-1 m. high ; leaves broadly ovate or oval, very strongly and sharply 

 serrate., conspicuously pointed at both ends., thin, 0.5-1.5 dm. long, the lower 

 abruptly narroiced to winged petioles ; heads in very short axillary clusters, or 

 the clusters somewhat prolonged at the ends of the branches ; rays 3-4. {S. 

 flexicaulis L., in part.) — Moist shaded banks, tliroughout ; commonest north w., 

 and s. along the mts. Late July-early Oct. 



5. S. Curtisii T. & G. Smooth or nearly so ; stem usually branched : leaves 

 oblong to long-lanceolate with gradually narroiced entire base., serrate above 

 with subulate teeth ; heads in small loose clu.sters; rays 4-7. — Open woods at 

 low elevations in the mountains, Va., W. Va., Ky., and southw. Aug.-Oct. 

 Var. puBExs (M. A. Curtis) Gray. Stems and often the under surfaces of the 

 leaves tomeutose. — Similar range. 



'o^ 



■W- ++ Achenes glabrous {rarely a little setulose) , inflorescence more thyrsoid. 



= Stems pubescent. 



6. S. bicolor L. Hoary or gi-ayish with soft hairs (rarely glabrate) ; stem 

 simple or paniculate-branched ; leaves oblong or elliptical-lanceolate, acute at 

 both ends, or the lower oval and tajiering into a petiole, slightly serrate ; clusters 

 or short racemes from the axils of the upper leaves, forming an interiiipted spike 

 or crowded panicle; involucre '6-b mm. long; the chartaceous v:hitisk-yeUow 

 obtuse bracts usually with the greenish midrib slender below but conspicu- 

 ously dilated above; rays 5-14, small, cream-color or nearly white; achenes 

 columnar. — Dry soil, P. E. I. to Ga., rarely inland to Ky., Mich., and Ont. 

 Late Aug.-Oct. 



7. S. hispida Muhl. Similar ; caulirie leaves oblanceolate to narrowly obo- 

 vate, narrowed at base, blunt or acutish at tip ; basal leaves mostly rounded at 

 tip, crenate-serrate ; involucre 4-^^ mm. long; the subherbaceous greenish or 

 greenish-straw-colored obtase bracts usually with the green midrib nearly uni- 

 form or only obscurely dilated above; rays orange-yellow ; achenes slightly 

 broadened upward. {S. bicolor, var. conrolor T. & G. ) — Diy or rocky banks, 

 Nfd. to Man., s. to the mts. of Ga., Mich., and Mo.; chiefly in calcareous 

 districts. July-early Sept. 



= = Stems glabrous or essentially so. 



8. S. erecta Pursh. Glabrous, or merely puberulent above ; leaves thickish, 

 firm, the lowest oblong or ovate-spatulate, crenate, the others narrower, entire ; 

 inflorescence as in no. 6 ; rays pale yellow or cream-colored. — Dr}" soil, L. L, 

 N. J., Pa., and southw. Aug.-Oct. 



9. S. monticola T. & G. Nearly glabrous ; stem slender, 3-9 dm. high ; 

 leaves thin, oblong-ovate to lanceolate, acute or tapering at both ends, the lower 

 serrate; heads small, the bracts acutish; rays 5-6. {S. roanensis Porter.) — 

 Allegheny Mts., from Pa. southw. July-Sept. 



-t- •*- Heads mostly large, the involucres 6{rarely 5)-12 mm. long, many- 

 flowered, forming an erect terminal thyrse ; leaves feather-veined. 



** Leaves numerous, short, sessile, entire, iiniform in size and shape ; cinereous 



plant of the Southwest. 



10. S. Lindheimeriana Scheele. Somewhat cinereous-puberulent, 2.5-8 dm. 

 high ; leaves lanceolate to oblong, sessile, subacute, often glutinous ; inflorescence 

 dense; involucre slender-campanulate, 5.5-7 mm. long; achenes glabrous. — 

 Limestone bluffs and gravel, and in rocky woods, Kan. to Tex. Sept.-Nov. 



