tfG6 COMPOSITE. (COMPOSITE FAMILY.) 



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

 panicle ; acheiiia silky-pubescent. Rocks, at the Falls of the Ohio, &c. A 

 kumdsr.aie species : heads 3" long, narrow. 



29. S. ftlissourieiisis, Nutt. Smooth throughout '1- 3 high) ; haves 

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

 oitgh margins, the lower very sharply serrate ; heads and dense crowded racemes 

 learly as in No. 19 ; achenia nearly glabrous. Dry prairies, from Illinois south- 

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



- *- Scales of the involucre narrow, thin and membranaceous : racemes mostly elon- 

 gated and numerous, forming a crowded ample panicle, (These all p resent inter- 

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



30. S. mpestris, Raf. Stem smooth and slender (2 -3 high); lcave 

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

 panicle narrow; heads very small; rays very short. Rocky river-banks, Ken- 

 tacky and Indiana. 



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

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

 vubescent beticath 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. PR6CERA, whitish-woolly underneath; and in var. sc.XiniA also very 

 rough above, often entire, and rugose-veined. 



32. S. SCrotilia, 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. Thickets and low 

 grounds ; common. Intermediate in character, and in the si/e of the heads and 

 rays, between the last and the next. 



33. S. gig; ft 11 tea, Ait. Stem stout (3 -7 high), smooth, often glaucous, 

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

 cept the narrowed base, rough-ciliate ; the ample panicle pubescent ; rays rather 

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

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



3. EUTIlAMIA, Nutt. Corymboscly much branched: h(-ads small, sessile, in 

 little clusters which are crowded in Jlat-toppcd corymbs ; the closely apnre&ed sralc* 

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

 numerous than the disk-Jlowers : leaves narrow, entire, sessile, croinh d. 



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

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

 cylindrical, in dense corymbcd clusters; rays 15-20. River-banks, &c. in 

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



35. S. teimifolia, Pursh. Smooth, slender ; AV//W vn-</ narrowly linear, 

 mostly \-nerved, dulled; heads obovoid-i-luh-shaped, in numerous clusters of 2 or 

 3. disposed in a Urose corymb; rays G-12. Sandy fields, M:u-.sad inset Is \f 

 Illinois, and southward ; common near the coast. 



