10. E. rotundifòlium, L. Downy-pubescent (2° high); _leaves roundish-ovate, obtuse_, truncate or slightly heart-shaped at the base, deeply crenate-toothed, triple-nerved, veiny, roughish (1--2´ long); corymb large and dense; _scales of the (5-flowered) involucre linear-lanceolate_, slightly pointed.--Dry soil, R. I. to Va., near the coast, and southward. Var. ovàtum, Torr. Usually taller, leaves ovate, acute, hardly truncate at base, more strongly serrate; heads 5--8-flowered. (E. pubescens, _Muhl._)--Mass. to Va., near the coast. 11. E. sessilifòlium, L. (UPLAND BONESET.) Stem tall (4--6° high), _smooth_, branching; _leaves oblong- 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-flowered involucre oval and oblong, obtuse_.--Copses and banks, Mass. to Ill., and southward along the mountains. [=][=] _Leaves opposite, clasping or united at the base, long, widely spreading; heads mostly 10--15-flowered; corymbs very compound and large._ 12. E. perfoliàtum, 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 beneath (5--8´ long); scales of the involucre linear-lanceolate.--Low grounds; common and well-known.--Varies with the heads 30--40-flowered, or with some or all of the leaves separated and truncate at base. Var. cuneàtum, Engelm. Leaves smaller, narrowed at base and separate, and heads fewer-flowered. Perhaps a hybrid with n. 7.--Mo. and southward. 13. E. resinòsum, 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, N. J.--Name from the copious resinous globules of the leaves. [*][*][*] _Heads 8--30-flowered; involucral scales nearly equal, in one row; leaves opposite, ovate, petioled, triple-nerved, not resinous-dotted; flowers white._ 14. E. ageratoìdes, L. (WHITE SNAKE-ROOT.) Smooth, branching (3° high); _leaves broadly ovate, pointed, coarsely and sharply toothed, long-petioled_, thin (3--5´ long); corymbs compound.--Rich woods; common northward. 15. E. aromáticum, L. Smooth or slightly downy; stems nearly simple; _leaves on short petioles, ovate, rather obtusely toothed, not pointed_, thickish.--Copses, Mass. to Va., and southward, near the coast.--Lower and more slender than n. 14, with fewer, but usually larger heads; not aromatic. § 2. CONOCLÍNIUM. _Receptacle conical; involucral scales nearly equal, somewhat imbricated._