COMPOSITAE (composite FAMILY) 783 



7. E. TorreylLnum Short. Erect, slender, 8-12 dm. high, gi-ayish-puberu- 

 lent ; leaves narrowly lanceolate^ coarsely toothed, the larger ones 5-7 cm. long^ 

 8-12 mm. wide, commonly proliferous in the axils ; corymbs flat-topped ; heada 

 small; involucral scales woolly. (E. hyssopifolium, var. laciniatum Gray.) — 

 Barrens, etc., l*a., Ky., and southw. 



8. E. semiserratum DC. Miimtely velvety-pubescent, branching, 6-Q dm. 

 high ; leaves lanceolate or ohlong, triple-ribbed and veiny, serrate above the 

 middle, tapering to the base, 1.5-2.5 cm. wide, the lower slightly petioled ; heads 

 small. — Damp soil, V'a. to Mo., and southw. — Leaves sometimes whorled in 

 threes, or the upper alternate. 



9. E. altissimum L. Stem stout and tall, 1-2 m. high, dou^ny ; leaves lan- 

 ceolate, tapering at both ends, conspicuously 'i-nerved^ entire, or toothed above 

 ihe middle, 0.5-1.3 dm. long, the uppermost alternate ; corymbs dense ; bracts 

 of the inviducre obtuse, shorter than the flowers. — Dry soil, Pa. to Minn., Neb., 

 and southw. 



+-•<-•*-•*- Leaves sessile or nearly so, loith a broad base, opposite or in threes; 



heads pubescent. 



++ Heads b-di-Jlowered ; leaves not clasping. 



10. E. verbenaef51ium Michx. Roughish-pubescent, 0.5-2.5 m. high ; leaves 

 ovatc-oblong and ovate-lanceolate, obtuse or truncate at base, slightly triple- 

 nerved, veiny, coarsely toothed or incised toward the base, the loWer shortly peti- 

 oled, the upper usually alternate ; branches of the corymb few, unequal ; bracts 

 of the involucre oblong-lanceolate, at length shorter than the flowers. (Includ- 

 ing var. Saiindersii Porter; E. teucrifolium Willd.) — Low grounds, Mass. to 

 Va., and southw., near the coast. 



11. E. rotundifblium L. Downy-pubescent, 3-8 dm. high ; leaves roundish- 

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

 serrate, triple-nerved, veiny, roughish, 2.5-5 cm. long; corymb large and dense ; 

 bracts of the b-flowered involucre linear-lanceolate, slightly pointed. — Dry soil, 

 R. I. to Va., Ark., and southw., chiefly near the coast. 



12. E. pubescens Muhl. Pubescent, 7-12 dm. high ; leaves ovate, acute, 

 hardly truncate at base, strongly serrate; heads 5-8-flowered. {E. rotundifo- 

 lium, var. ovatum Torr.) — Rocky woods, s. Me. to Va. and Ky., chiefly near 

 the coast. 



13. E. sessiUf^^ium L. (Upland Boneset.) Stem tall (0.5-1.8 m. high), 

 smooth, branchipg ; leaves oblong- or ovate-lanceolate, tapering from near the 

 rounded sessile base to the sharp jyoint, serrate, veiny, smooth, 0.7-1.5 dm. long; 

 corymb very compound, pubescent ; bracts of the b-flowered involucre oval and 

 oblong, obtuse. — Copses and banks, Vt. and Mass. to 111., Mo., and southw. 

 along the mts. 



Var. Brittonianum Porter. Leaves ovate or ovate-oblong, acute or short- 

 acuminate, 2.5-4 cm. long ; inflorescence very contracted. — Budd's Lake, N. J. 

 {Porter). 



■^ ++ Leaves opposite, clasping or united at the base, long, widely spreading ; 

 heads 10-40-flowered ; corymbs very compound and large. 



14. E. perfoliatum L. (Thoroughwort, Boneset.) Stem stout, 0.5-1.5 m. 

 high, hairy; leaves lanceolate, united at the base around the stem (connate- 

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

 beneath, 1-2 dm. long ; bracts of the involucre linear-lanceolate. — Low grounds; 

 common and well known. Var. truncXtdm Gray. At least the upper leaves 

 separate, truncate or rounded at base. — With the typical form. 



Var. cuneatum Engelm. Leaves smaller, narrowed at base and separate ; 

 the heads fewer-flowered. — Mo., and southw. — Perhaps a hybrid with no. 8. 



15. E. resin6sum 'I'orr. Mimitely velvety -downy, i\-^ dva.\\v^\\\ leaves linear- 

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

 veiny beneath, 1-1.5 dm. long ; bracts of the invokicre oval, obtuse. — Wet pine 

 barrens, N. J. — Name from the copious resinous globules of the leaves. 



