226 coMrosnvE. (compositk family.) 



9. E. rotundifblium, L. Downy-pubescent (2° high) ; hares ronndish- 

 ovalf, obliise, tnincato or slij:htly heart-shaped at tlie base, deeply erenate-tootlicd, 

 triple-nerved, veiny, I'oughish (I' -2' long) ; corymb large and dense; scales of 

 the (i>-f1uwfncl) involucre linear-laticfolute, slightly pointed. — Dry soil, Rhode 

 Island to Virj;iiiia, near the coast, and southward. 



10. E. pubescens, Muhl. rultcseent: Imces ovale, moslly ocu^e, slightly 

 truncate at the base, serrate-toothed, .somewhat triple-nerved, veiny ; scales of the 

 7 - 8-Jloirered involucre lanceolate, acute. ( E. ovatum, Biijcl.) — Massachusetts to 

 New Jersey, near the coast, and Kentucky. — Like the last, but larger. 



11. E. sessilifdlium, L. (Upland Boneset.) Stem tall (4°- G° high), 

 smooth, branching ; leaves lanceolate or ovate-lanceolate, taperimj from near the ronmhd 

 sessile base to the sharp point, serrate, veiny, smooth (3' -6' long) ; corymb very 

 compound, pubescent ; scales of the 5- (or 5-12- \) flowered involucre oval and oblong, 

 obtuse. — Copses and banks, Massachusetts to Illinois, and southward along the 

 mountains. 



•<-••-•<- Leaves opfjosile, clasping or united at the base, long, ividelg spreading : heads 

 nuistlij \0-\5-Jlowered: coripnbs veri/ compound and large. 



12. E. resinbsum, Torr. Mmutelg velvelipdowny (2° -3° high); leaves 

 linear-lanceolate, elongated, serrate, paillij clasping, tapering to the point, sliglitly 

 veiny beneath (4' -6' long); scales of the involucre oval, obtuse. — Wet pine 

 barrens, New Jersey. — Name from the copious resinous globules of the leaves. 



13. E. perfoliatum, L. (Thoroughwort. Boneset.) Stem stout 

 (2° -4° high), hairy ; leaves lanceolate, united at the base around the stem (connatc- 

 perfoliate), tapering to a slender point, serrate, very veiny, wrinkled, downy be- 

 neath (5'-8' long) ; scales of the involucre linear-lanceolate. — Low grounds: 

 common and well-known. — "Varies with the heads 30- 40-flowered. 



-I- -t- -t- -t- Leaver long-petioled, the upper ones alternate : heads 12-1 T^-floivered, in 

 compound cori/mhs. 



14. E. serdtinum, Michx. Stem pulverulent-pubescent, bushy-branched 

 (3^-6° high); leaves ovate-lanceolate, tapering to a point, triple-nerved and 

 veiny, coarsely serrate (5' -6' long); involucre very pubescent. — Alluvial 

 ground, Maryland to Illinois and southward. 



* * * Heads 8 - t^O-fowered ; the scales of the involucre nearli/ equal and in one 

 row: leaves opposite, ovate, petioled, triple-nerved and veini/, not resinous-dotted: 

 flowers white. 



15. E. ageratoides, L. (WrriXE S\ake-root.) Smooth, branching 

 (3° high); leans broadli/ orate, jwinted, coarseli/ and sharplg toothed, long-pdioled, 

 thill (4' -5' long) ; corymbs compound. — Hicli woods: common northward. 



16. E, arom^ticum, L. Smooth or slightly downy ; stems nearly sim- 

 ple ; haves on short petioles, ovale, rather obtusili/ toothed, not poi>it<d, thickish. — 

 Copses, Massachusetts to Virginia and southward, near the coast. — Lower and 

 more slender than No. 15, with fewer, but usually larger heads. 



7. MIKANIA, Willd. Climkixg Hemp-weed. 



Heads 4-flowered. Involucre of 4 scales. Receptacle small. Flowers and 

 achenia, &c., as in Eupatorium. — Twining perennials, climbing bushes, with 



