226 COMPOSITE. (COMPOSITE FAMILY.) 



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

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

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

 the (^-flowered] involucre linear-lanceolate, slightly pointed. Dry soil, Rhode 

 Island to Virginia, near the coast, and southward. 



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

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

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

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



1 1 . E. sessilifblium, 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. 



H- H- - 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. (THOROUGHWORT. 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 12-1 5-Jlowered, 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 



