COMPOSITAE (composite FAMILY) 791 



gmtrea, vars. Bandii and BedfieUU Porter ; 8. humilis Man. ed. 6, in part, 

 not Pursh.) — Dry or rocky (commonly granitic, etc.) soil, e. Me. to Micli., 

 soutliw. along the mts. to s. N. H. and w. Mass. July-early Sept. Passing 

 freely to var. MONTfcoLA (Porter) Fernald. Lower (0.5-5 dm. high), with a 

 dense solitary thyrse 2-10 cm. long. (S. Virgaurea, var. Porter ; 8. Virgaurea, 

 var. Deanei Porter.) — More exposed situations. 



2. Midrib of the leaves usually obscure; inflorescence 1-several racemes or 

 interrupted thyrses, many of the pedicels 5-15 (or rarely 25) mm. long. 



15. S. racembsa Greene. Often glutinous ; stems usually clustered, rather 

 strict, slender and nearly terete, very leafy, 1-6 dm. high ; basal and lower 

 leaves oblanceolate, mostly acute or subalcute, 3-12 cm. long, 5-7 mm. broad, 

 more or less crenate or serrate above the middle ; cauline leaves 10-30 or more, 

 oblanceolate to linear, the uppermost entire and 1-3.5 cm. long, all {in well- 

 developed plants') bearing axillary fascicles ; racemes solitary, 5-15 cm. long, 

 rarely panicled ; involucre 5-8 mm. high, the linear bracts obtuse or acutish ; 

 achenes 2-3 mm. long, finely appressed-setulose ; pappus minutely serrulate. 

 (8. humilis Man. ed. 0, in great part, not Pursh ; 8. Furshii Porter, as to 

 description, but not as to type, i.e. the Pursh plant.) — Calcareous ledges and 

 cliffs, local, N. B. to Va., w. to the sand-hills of L. Mich. July-Sept. 



Var. Gillmani (Gray) Fernald. Much larger; basal leaves 1.5-3 dm. long, 

 coarsely toothed; the abundant racemes forming a panicle 3-4 dm. long. 

 (8. humilis, var. Gray; 8. Virgaurea, var. Porter.) — Sand-hills and rocks 

 along the Great Lakes, Ont. and Mich. 



16. S. deciimbens Greene. Similar; the decumbent rigid stems 0.5-4 dm. 

 high, simple, remotely leafy; basal and lower leaves spatulate-obovate to 

 -oblanceolate, chiefly rounded or blunt at tip, 1.5-9 cm. long, 8-20 mm. broad, 

 toothed above the middle ; cauline leaves 4-9 below the inflorescence, without 

 axillary fascicles ; raceme lax, ."-20 cm. long ; involucre 6-7 mm. high, its firm 

 linear bracts obtuse. • — Serpentine rock, Mt. Albert, Que. ; shores of L. Superior ; 

 Alb. and B. C. to Col., and Wash. July, Aug. 



■t- +- -1- Heads small or middle-sized, the involucres 2-5 {rarely 6) mm. long, 

 panicled or thyrsoidal, not in a terminal corymbiform cyme; neither alpine 

 nor high-northern. 



** Leaves commonly veiny, not S-ribbed (but sometimes obscurely triple- 

 nerved). 



= Heads in a slender virgate or thyrsoid panicle, 

 a. Stem puberulent or pulverulent. 



17. S. pubfirula Nutt. 8tem (2-10 dm. high, simple or branched) and pan- 

 icle minutely hoary; stem-leaves numerous, lanceolate, acute, tapering to the 

 base, mostly entire, smoothish, the uppermost 1.5-5 cm. long ; the lower wedge- 

 lanceolate and sparingly toothed ; heads very numerous and crowded in compact 

 short racemes forming a prolonged and dense slender or pyramidal panicle ; 

 involucre 3-4 mm. long, its bracts linear-awl-shaped, appressed ; rays about 10. 



. Dry or sandy soil, P. E. 1. to w. Que., s. to Fla. and Miss., mostly near the 



coast. Aug.-Oct. 



6. 8tem glabrous. 



1. Axis and branches of the inflorescence glabrous. 



18. S. strlcta Ait. Vei-y smooth throughout ; stem strict and simple, wand- 

 like, 0.5-2.5 m. high, slender, beset with small and entire appressed lanceolate- 

 oblong thickish leaves, these gradually reduced upward to mere bracts (5-15 mm. 

 long) ; the lowest oblong-spatulate ; heads crowded in a very slender compound 

 spi'cate raceme; involucre 4-5 mm. long ; rays 5-7. — Damp pine barrens and 

 prairies, N. J. to Fla. and Tex. Sept.-Nov. (W. I.) 



2. Axis and branches of the inflorescence pubescent. 



in. S. uliginbsa Nutt. Smtmth up to the inflorescence; stem simple, strict, 

 3-10 dm. high ; leaves thickish, lanceolate, pointed, the lower 1-4 dm. long, 



