226 COMPOSITE. (composite family.) 



9. E. rotundifdlium, L. Downy-pubescent (2° high) ; leaves roundish- 

 ovate, obtuse, truncate or slightly heart-shaped at the base, deeply crenate-toothed, 

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

 the (5-Jlowered) involucre linear-lanceolate, slightly pointed. — Dry soil, Rhode 

 Island to Virginia, near the coast, and southward. 



10. E. pubdscens, Muhl. Pubescent : leaves ovate, mostly acute, slightly 

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

 7 - 8-flowered involucre lanceolate, acute. (E. ovatum, Bigel.) — Massachusetts to 

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



11. E. sessilifdlium, L. (Upland Boneset.) Stem tall (4° -6° high), 

 smooth, branching ; leaves lanceolate or ovate-lanceolate, tapering from near the rounded 

 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. 



-i — -i — -i — Leaves opposite, clasping or united at the base, long, widely spreading : heads 

 mostly \0-l5-flowered: corymbs very compound and large. 



12. E. resinbsum, Torr. Minutely velvety-downy (2° -3° high); leaves 

 linear-lanceolate, elongated, serrate, partly clasping, tapering to the point, slightly 

 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. (Thoroughwoet. Boneset.) Stem stout 

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

 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. 



-• — -< — -»— -* — Leaves long-petioled, the upper ones alternate: heads 12 -\5-ftowered, in 

 compound corymbs. 



14. E. serotinum, 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 - 30-flowered ; the scales of the involucre nearly equal and in one 

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

 flowers white. 



15. E. ageratoides, L. (White Snake-root.) Smooth, branching 

 (3° high); leaves broadly ovate, pointed, coarsely and sharply toothed, long-petioled, 

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



16. E. aromaticum, L. Smooth or slightly downy ; stems nearly sim- 

 ple ; leaves on short petioles, ovate, rather obtusely toothed, not pointed, 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. Climbing Hemp-weed. 



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

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



