218 COMPOSITE. (COMPOSITE FAMILY.) 



pointed, serrate, rough alx)ve, rounded or acute at the base, petioted, 



ami do imi/ beneath; scales of the involucre lance-awl-shaped, slight- 

 ly ciliate. Dry plains, Ohio to Illinois, and south west ward Probably runs 

 into th 



12. II. tOIllcntOSUS, Michx. Stem Iiairy, stout (4 -8 high); leaves 

 oblong-lanctolate, or the lowest ovate, taper-pointed, obscurely serrate, large (5' -12 

 long), somewhat petioled, very rough above, soft-doirnij bi-nilh ; scales of the in- 

 volucre with very long and spreading tips, hairy, the chat]' and tips of the disk- 

 ilosvcrs pubescent. (Disk 1' broad; rays 12-16, 1' long.) Kich woods, Illi- 

 nois ? Virginia and southward along the mountains. 



- - Leaves opposite, or the uppermost alternate, 3-nerved or triple-ribbed. 



13. II. StniniOSUS, L. Stem rather simple (3 -4 high), smooth be- 

 low ; leaves ovate-lanceolate, taperiny gradually to a point, seirate ivith small oppressed 

 teeth, abniptly contracted into short margined petioles, rough above, n-Jiitish and 

 naked or minutely downy underneath ; scales of the involucre broadly lanceolate 

 with spreading tips, equalling the disk; rays mostly 10. Var. MOLLIS has tire 

 leaves softly downy underneath. River-banks and low copses ; common, espe- 

 cially westward. 



14. II. divai'icatllS, L. Stem simple or forked and corymbed at tho 

 top (l-4 high) smooth; leaves all opposite and divaricate, ovate-lanceolate, 3- 

 nervedfrom the rounded or truncate sessile base, tapering gradually to a sharp point 

 (3' -6' long), serrate, thickish, rough both sides; scales of the involucre lanceolate 

 from a broad base, pointed, equalling the disk ; rays 8-12. Thickets and bar- 

 rens; common. Disk ' wide; rays 1' long. 



1 5. II. hirsiltlis, Raf. Stem simple or forked above, stout ( 1 - 2 high ), 

 bristly-hairy; traces more or less petioled, ovate-lanceolate, gradually pointed, slightly 

 serrate, rounded or obtuse at the base, very rough above, rough-hairy underneath ; 

 scales of the involucre ovate-lanceolate, pointed, equalling the disk ; rays about 

 12. Dry plains, &c., Ohio to Illinois, and southward. Too near the last. 



16. II. tracliciiifolitis, Willd. Stem loosely branched, tall, hairy; 

 leaves thin, ovate-lanceolate, or oblong-lanceolate, taper-pointed, sharply serrate, 

 smoothish or roiujhish-pnbescent both sides, contracted into short petioles; scales of 

 the involucre lanceolate-linear, elongated and very taper-pointed, loose, exceed- 

 ing the disk ; rays 12-15. Copses, Penn. 1 Ohio to Illinois, and southward. 

 Probably runs into the next. 



17. II. dccapctalUS, L. Stem branching (3 -6 high), smooth be- 

 low; hares thin and green both sides, smooth or roughish, ovate, coarse/ 1/ serrate, 

 pointed, abruptly contracted into margined petioles; scales of the involucre 

 lanceolate-linear, elongated, loosely spreading, the outer longer than the disk ; 

 rays about 10. Var. FROND6sus has the outer involucral scales foiiareous or 

 changinir to leaves. Copses and low banks of streams; common, especially 

 northward. (II. multiflorus, L., is probably a cultivated stale of this.) 



18. II. doroniCOldcS, Lam. Stem stout (5-0 high), branching, 

 rough-lid! ni ahore ; latres ovate or oblony-la/icioldte, pointed, ^crrnlc, strongfy triple- 

 ocincd, rough above, ,;moothisli or douny underneath, the lower often heart-shaped 



