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; invulucral scales woolly. (E. hyssopifolium, var. laciniatum Gray.) 

 Barrens, etc., Pa., Ky., and south w. 



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

 hi,L, r h ; 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. 



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

 ceolate, tapering at both ends, conspicuously 3-nerved. entire, or toothed above 

 ihe 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- - 1- Leaves sessile or nearly so, with a broad base, opposite or in threes; 



heads pubescent. 



++ Heads 5-8-flowered ; leaves not clasping. 



10. E. verbenaefblium Michx. Roughish-pubescent, 0.6-2.5 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, creuate 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. sessitifiHum 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 point, serrate, veiny, smooth, 0.7-1.5 dm. long ; 

 corymb ve^ry compound, pubescent ; bracts of the 5-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. 5m. 

 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. TRCSCATUM 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. resinosum Torr. Minutely velvety-downy, 6-9 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. 



