206 coMPOsiTiE.'* (composite family.) 



above the middle with scattered fine teeth ; racemes mostly short in a crowded 

 panicle ; achenia silkij-puhescent. — Kocks, at the Falls of the Ohio, &c. — A 

 handsome species : heads 3" long, narrow. 



29. S. MissouricnsiS, Nutt. Smooth throughout (1°- 3° high); leaves 

 linear-lanceolate, or the lower broadly lanceolate, tapering to both ends, with very 

 rough margins, the lower vertj sharply serrate ; heads and dense crowded racemes 

 nearly as in No. 19 ; achenia nearly glabrous. — Dry prairies, from Illinois so'ath- 

 ward and westward. — Heads l^"-2" long. 



-*^ H- Scales of the involucre narrow, thin and membranaceous ; racemes mostly elon- 

 gated and numerous, forming a crowded ample panicle. (These all pres ;nt inter- 

 mediate forms, and perhaps may be reduced to one polymorphous species.) 



30. S. rupestris, Eaf. Stem smooth and slender (2° -3° high); leaves 

 linear-lanceolate, tapering to both ends, smooth and glabrous, entire, ov nearly so ; 

 panicle naiTow; lieads very small; rays very s/iort. -r- Rocky river-banks, Ken- 

 tucky and Indiana. 



31. S. Canadensis, L. Stem rough-hairy, tall and stout (3°-6° high) ; 

 leaves lanceolate, pointed, sharply seirate (sometimes almost entire), more or less 

 pubescent beneath and rough above; heads small; rays very short. — Borders of thick- 

 ets and fields ; very common. — Varies greatly in the roughness and hairiness of 

 the stem and leaves, the latter oblong-lanceolate or elongated linear-lanceolate ; 

 — in var. pr6cbra, whitish-woolly underneath; and in rar. scisRA also very 

 rough above, often entire, and rugose-veined. 



32. S. serotina, Ait. Stem very smooth, tall and stout (4° -8° high), 

 often glaucous ; leaves lanceolate, pointed, serrate, roughish above, smooth except 

 the veins underneath, which are more or less hairy ; rays short. — Tliickcts and low 

 grounds ; common. — Intermediate in character, and in the size of the heads and 

 rays, between the last and the next. 



33. S. g1§^:tntea. Ait. Stem stout (3° -7° high), smoort, o/?en glaucous; 

 leaves quite smooth both sides, lanceolate, taper-pointed, very sharply serrate, ex- 

 cept the nan'owed base, rough-ciliate ; the ample panicle pubescent ; rays rathiir 

 long. — Copses and fence-rows ; common : — presenting many varieties, but with 

 decidedly larger heads and rays than in the preceding. Seldom very tall. 



§ 4. EUTHAMIA, Nutt. — Corymbosely much branched: heads small, sessile in 

 little clusters which are crowded in flat-topped coiymbs ; the closely appressed scales 

 of the involucre somewhat glutinous : receptacle fimbrillate : rays 6 - 20, short, more 

 numerous than the dish-flowers : leaves narrow, entire, sessile, crowded. 



34. S. lanceolata, L. Leaves lanceolate-linear, 3-5-nei-ved, the nerves, 

 margins, and angles of the branches minutely rough-pubescent ; lieads obovoid- 

 cylindrical, in dense corymbed clusters; rays 15-20. — Elver-banks, &c. in 

 moist soil ; common. — Stem 2° - 4° high : leaves 3' - 5' long. 



35. S. tennifolia, Pursh. Smooth, slender ; leaves very narrowly linear, 

 mostly l-nerved, dotted; heads obovoid-club-shaped, in numerous dusters of 2 or 

 3, disposed in a loose coiymb ; rays 6-12. — Sandy fields, Massachusetts to 

 Illinoi.i, and southward ; common near the coast. 



