COMl'OSIT.K. (tOMl'OSlTi: 1 AMILV.) 257 



12. H. grosse-SerrktUS, Miutciis. Stem smooth and yfatifous, at least 

 below (5" - lu^' lii;L;li) ; /ains clon<jal(ul-.'<i>iciolatc or ovate-hmccolatc, taixT- 

 irtintod, senate, iDiigli above, rouiidod or acute at the base, peliokil, /tomij- 

 clotinij liencuth ; scales of the involucre lance-a\vl-sha]jcd, slightly ciliate. — Dry 

 j)laiiis, Ohio to Illinois, and southwestward. — Probably runs into the last. 



13. H. tomentdsUS, Michx. Stem hairy, stout (4° -8° high); leaven 

 oUong-lancio'.alv, or the lowest owttc, taper-pointed, obscurely serrate, large (5'- 

 12' long), somewhat ])etiolcd, veri/ roiu/h above, sojl-downij liencath ; scales of the 

 involucre with very long and si)reading tips, hairy; the chaff and tips of the 

 disk-flowers pubescent. (Disk 1' broad; rays l.'i-16 about I' long.) — Rich 

 woods, Illinois 1 Virginia and southward along the mountain*. 



■*- ■*- Leaves opposite, or the npjKrmost alternate, S-nerced or triple-ribbed. 



14. H. Stl'Umbsus, L. Stem (30-4° high) smooth below; leaves ovate- 

 lanceolate, tapering (jradudl If to a point, serrate with small appressed t<tth, abruptly 

 contracted into short margined jjetioles, rough above, whitish and nuked or mi- 

 nutetij duwiiij underneath ; scales of the involucre broadly lanceolate with spread- 

 ing tips, equalling the disk; rays mostly 10. — Var. m6llis has the leaves 

 softly downy underneath. — Kiver-banks and low copses . common, especially 

 westward. 



15. H. divaricitUS, L. Stem simple or forked and corymbed at the top 

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

 from 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 ba.se, pointed, equalling the disk; rays 8-12. — Thickets and 

 barrens: common. — Disk 6" wide ; rays I 'long. 



16. H. hirstltUS, Raf. Stem simple or forked above, stout (1° - 2° lii-k), 

 hristlg-hiiiri/ ; haves more or less jictioled, ovate-lanciolate, gradually ])ointed, slighlli/ 

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

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

 12. — Dry plains. Oliio to Wisconsin, and southward. — Runs into the hxst. 



17. H. traeheliifdlius, Willd. Stem loosely branched, tall, hairy; 

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

 smoothish or ronghish/wbescent both s/V/es, contnicted into short jietioles; scales of 

 the involucre lanceolate-linear, elongated and very taper-pointed, loose, e.vceed- 

 ing the disk; rays 12- 15. — Copses, Pennsylvania and Ohio to Illinois, and 

 southward. — Probably runs into the next. 



18. H. decapetalus, L. Stem branching (3°-G° high), smooth below; 

 leaves thin and gieen both sides, sviuoth or roiighislt, ovale, coarsely serrate, pointed, 

 abruptly contracted into margined petioles; scales of the involucre lanceolate- 

 linear, elongated, loo.sely spreading, the outer longer than the disk; rays about 

 10. — Var. FKONUOsu.s has the outer involucral scales foliaceous or changing to 

 leaves. — Copses and low banks of streams: common, especially northward. 

 (11. mnltitlorus, L., may be a cultivated state of this.) 



I'J. H. dOX'OllicOideS, Lam. Stem stout (5°- 9° high),branihing, roi/yA- 

 hiiiry above; leaves ovale or olilong-lanrtolale, pointid, serrule, strongly Iripb-vtintd, 

 rough above, smoothish or dmcny underneath, the lower often heurt-shaped and ou 

 L & M— 31 



