COMPOSITAE (composite FAMILY) 783 



7. E. Torreyanum Short. Erect, slender, 8-12 dm. high, grayish-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 ; heads 

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

 Barrens, etc., Pa., Ky., and southw. 



^ 8. E. semiserratum UC. Minutely velvety-pubescent, branching, 6-9 dm. 

 high ; leaves lanceolate or oblong, 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, Va. to Mo., and southw. —Leaves sometimes whorled in 

 threes, or the upper alternate. 



9. E. altlssimum L. Stem stout and tall, 1-2 m. high, downy ; leaves lan- 

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

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

 of the involucre obtuse^ shorter than the flowers. — Dry soil. Pa. to Minn. Neb. 

 and southw. ' "' 



H_ ^_ 4_ ^_ Leaves sessile or nearly so, with a broad base, opposite or in threes • 



heads pubescent. 



++ Heads 5-8-Jlowe7'ed ; leaves not clasping. 



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

 ovate-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. Saundersii 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 ^-flowered involucre linear-lanceolate, slightly pointed. — Dry soil, 

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



12. E. pub§scens 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. sessilif51ium L. (Upland Boneset.) Stem tall (0.5-1.8 m. high), 

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

 rounded sessile base to the sharp poirit, 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, icidely spreading ; 

 heads 10-A^-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. truncXtum Gray. At least the upper leaves 

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



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. resinbsum Torr. Minutely velvety-downy, 0-9 dm. high ; leaves linear- 

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

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

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



