200 COMPOSITE. (COMPOSITE FAMILY.) 



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

 panicle; achcnia silky-pubescent. Rocks, at the Falls of the Ohio, e. A 

 handsome species : heads 3" long, narrow. 



29. S. UliSSOliricnsiS, Nutt. Smooth throughout (1- 3 high) ; Aa/vs 



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

 rough margins, the lower very sharply serrate; heads and druse crowded vaccines 

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

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



*- -i- Scales of the involucre narrow, thin and membranaccous : raccims mostly dun- 

 gated and numerous, forming a croicded ample panicle, (These all present inter- 

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



30. S. rtlpt'StriS, Raf. Stem smooth and slender (2 -3 high); /. ar,s 

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

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

 tucky and Indiana. 



31. S. Caiiadcnsis, L. Stem rough-hairy, tall and stout (3-G 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. ru6cERA, whitish-woolly underneath; and in var. SCABRA 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 size of the heads and 

 rays, between the last and the next. 



33. S. grigtflltea, 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. 



$ 3. EUTIlAMIA, Nutt. Corymbosely much branched : heads small, sessile in 

 little cliuten which are crowded in flat-topjyed corymbs ; the closely oppressed sva/<s 

 of the involucre somewhat glutinous : receptacle fimbr ill at <>: rays 6-20, s/tort, more 

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



34. S. lanccolftta, 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. 



3.1 S. tCJlllifolia, Pursh. Smooth, slender; /cares m;// narrowly Hnntr, 

 iiiiisfli/ \-< rnd, dulled; heads obovoid-elub-shaped, in numerous elustrrs of 2 OF 

 3, di-pfi>i'd in a loose corymb; rays 6-12. Sandy fields, Massachusetts to 

 Illinois, and southward ; common near the coast. 



