206 COMPOSITE. (COMPOSITE FAMILY.) 



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

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

 handsome species : heads 3" long, narrow. 



29. S. JUlSSOliriensiS, Nutt. Smooth throughout (l-3 high); leaves 

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

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

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

 ward and westAvard. 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 pres ^nt inter- 

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



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

 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- 

 tucky and Indiana. 



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

 leaves lanceolate, pointed, sharply serrate (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. PR6CERA, whitish-woolly underneath; and in rar. SCA.BRA also very 

 rough above, often entire, and rugose-veined. 



32. S. serdtina, 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 size of the heads and 

 rays, between the last and the next. 



33. S. gigiinfca, 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, 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 fiat-topped corymbs ; the closely oppressed scales 

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

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



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

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

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

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



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

 mostly l-nerved, dotted; heads obo void-club-shaped, in numerous clusters of 2 or 

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

 Illinois, and southward ; common near the coast- 



