15 E. sessilifolium L. Lvs. opposite, amplexicaul, ovate-lanceolate, rounded at the base, very smooth, serrate; st. smooth; inner scales oblong-obovate, oblwe.- Plant 2 to 4f high, in rocky woods, Mass. to Ind. and Ga. - St. slender, erect, branching at top into a corymb with white fls. Lvs. large, tapering regularly from the somewhat truncate base to a long point, with small serratures, paler beneath. Flower-stalks downy. Hds. 5-flowered, with twice as many scales in 2 rows. Sept.
16 E. rotundifdlium Willd. Hoarhound. Lvs. opposite, sessile, roundish-ovate, subcordate at base, 3-veined and veinleted, coarsely serrate, scabrous above, pubescent beneath; hds. about 5-flowered; inner scales acuminate, as long as the flowers. - A bushy, compact species, in dry fields, N. J. and S. States. St. 2 to 3f high, roughish. Lvs. 1 to 2' by 9 to 20", obtuse or broadly acute. Hds. fastigi-ate-corymbous. Invol. very pubescent, concealing the white florets. Pappus longer than cor. Sty. much exserted. Aug. Sept.
17 E. pubescens Muhl. St. hirsute; lvs. opposite, sessile, distinct, ovate, acute, obtusely dentate, rough-pubescent; corymb fastigiate; invol. about 8-flowered; scales lanceolate, acute, rather shorter than the flowers. - A large, rough plant, 3 to 4f high, growing on dry grounds, N. H. to Penn. Distinguished from No. 16 by its larger lvs. (2 to 3' by 1 1/2 to 2 ), hds., and proportionately shorter scales, which are about 12, the outer much the shortest Aug. (E. ovatum Bw.)
18 E. perfoliatum L. Thorocgh-wort. Boneset. Lvs. connate-perfoliate, very pubescent. - A common, well-known plant, on low grounds, meadows, U. S. and Can., abundant. St. 1 to 5f high, round, rough, and hairy. Each pair of lvs. are so united at the base as to constitute a single lamina, centrally perforated by the stem, and placed at right angles to it; they are rough, rugose, serrate, tapering to a long point, and both combined, are 8 to 14' in length. Hds, about 12-flowered, clustered in large, terminal corymbs. Cor. white. Aug. - The plant is bitter, and is used in medicine as a tonic.
19 E. resinosum Torr. St. minutely tomentous; lvs. linear-lanceolate, closely sessile, distinct, tapering to a long acumination, divaricate with the stem, slightly viscidly resinous-glandular both sides; corymb fastigiate, compound; lids. 10 to 15-flowered: scales obtuse, hoary-tomentous. - Wet, sandy soils, N. J., Penn. St. 2 to 3f high, growing in tufts. Lvs. 3 to 6' by 3 to 6". Aug., Sept.- This singular species appears to be nearly confined to the pine barrens of N. J., where it was first found by Dr. Torrey.
20 E. serdtinum Mx. St. soft-puberulent, diffusely branched; lvs. petiolate, lance-ovate, acute or acuminate, sharply serrate, triple-veined, nearly glabrous; corymbs compound; hds. 12 to 15-flowered; scales 9 to 11, nearly alike, scarious-edged, very pubescent. - Ind. to Iowa (Cousens), and Ga. (Miss Keen). St. 4 to 6f high, somewhat paniculato above. Lvs. 4 to 6' by 3/4 to 11/2', upper ones nearly entire, scattered; lower ones opposite, with largo irregular serratures. Sept., Oct.
21 E. ageratoides L. St. smooth, branched; lvs. on long petioles, subcordate, ovate, acuminate, dentate, 3-veined, nearly smooth; corymbs compound; invol. simple, smooth. - Rocky hills and woods, Can. and U. S. St round, 2 to 4f high, and with the whole plant nearly smooth. Lvs. large, 3 to 6' long, 2 to 4' broad at base, coarsely toothed, petioles 1 to 2' long. lids, numerous, in small clusters, constituting a compound corymb. Invol. scales mostly in a row, containing 12 or more flowers of a pure white. Aug., Sept.
22 E. aromaticum L. St. rough, pubescent, corymbous at summit; lvs. petio-late, opposite, subcordate, lance-ovate, acute, 3-veined, obtusely serrate, smoothish; invol. simple, of about 12 lance-linear pubescent scales. - A handsome species, in low woods, Mass. to La. Whole plant slightly pubescent, about 2f high. Lvs. 2 to 4' long, J as wide, on petioles less than an inch long. Hds. of the fls. large, 10 to 15-flowered, white and aromatic, in small corymbs. Scales about equal. Aug., Sept.
23 E. incarnatum Walt. Minutely scabrous, diffusely branched; lvs. deltoid-ovate, long-petioled, pointed, coarsely crenate-toothed. truncate or cordate; hds. on slender ped., about 20-flowered; scales 12 to 15, linear-acuminate, faintly 2-striate, glabrous; cor. lobes paie-purpl. - Damp soils, N. Car. (Shriver) to Fla. (Chapman) and Tex. Height 2 to 3f. Corymbs very loose, paniculate. Sept., Nov. Approaches Conoclinium, but readily distinguished by its short, blunt styles.
11. MIKA'NIA, Willd. Climbing Boneset. (In honor of Prof. Mikan, of Prague.) Flowers all tubular, ; involucre 4-lcaved, 4-flow-ered; receptacle naked; pappus capillary, simple, scabrous; anthers partly exserted; achenia angled. - Mostly climbing herbs. Lvs. opposite.
M. scandens Willd. St. smooth ; lvs. cordate, repand-toothed, acuminate, the lobes divaricate, rather unequal; hds. in pedunculate, axillary corymbs. - A beautiful climber of wet thickets, Mass. to Ga. (Miss Keen) and La., rather rare. Every part smooth. Lvs. 2 to 3' by 1 to 2', on petioles 1 to 2' long, apex tapering to a long point. Branches short, nearly naked, each bearing a small corymb of white or pink colored fls., almost always 4 in a head. Aug., Sept.
12. C0N0CLIN'IUM,DC. (Gr. . a cone, , bed or receptacle.) Heads many-flowered ; receptacle conical, character otherwise as in Enpatorium. - Ц Herbaceous or suffruticous. Lvs. opposite, petio-late, serrate. Fls. blue or purple, in crowded corymbs.
C. ccelestinum DC. Herbaceous, nearly glabrous, much-branched, lvs. deltoid-ovate, truncate or subcordate at base, tapering to an obtusish apex, crenate-ser-rate, 3-veined, petiole slender, about half as long as the lamina; corymbs numerous, subumbellate, scales numerous, linear. - Hedges, thickets, roadsides, etc, Penn., Southern and W. States. St J to 2if high, terete, with opposite branches