316 LXXV. COMPOSITE. Conoclinium. 



* * * Leaves opposite. Heads 8 — 20-Jlowered. 



13. E. PERFOLiATUM. Thoroiighwort. Boneset. 



Uvs. connate-perfoliate, very pubescent. — A common, well known plant, 

 on low grounds, meadows, U. S. and Can. Abundant. Stem 1— 5f high, 

 round, rough and hairy. Each pair of leaves 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—14' in length. Heads about 12-flowered, clustered in large, 

 terminal corymbs. Corollas white. Aug. — The plant is bitter, and is used in 

 medicine as a tonic. 



• 14. E. RESTNosuM. Torr. 



St. minutely tomentose ; Ivs. linear-lanceolate, closely sessile, tapering to 

 a long acumination, divaricate with the stem, slightly viscidly glandular both 

 sides; corymb fastigiate, compound; hds. 10 — 15-flowered; scales obtuse, hoary- 

 tomentose. — Wet, sandy soils, N. J., Penn. Stem 2 — 3f high, growing in tufts. 

 Leaves 3 — 6' by 3 — 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. 



15. E. AGERAToiDES. NcttU-leaved Eupatorium. 



St. smooth, somewhat branched ; Ivs. on long petioles, subcordate, ovate, 

 acuminate, dentate, 3-veined, nearly smooth ; con/mbs compound ; invol. simple, 

 smooth. — Rocky hills and woods, Can. and U. S. Stem round, 2 — 4f high, 

 and with the whole plant nearly smooth. Leaves large, 3 — 6' long, 2 — 4' broad 

 at base, coarsely toothed, petioles 1 — 2' long. Heads numerous, in small clus- 

 ters, constituting a compound corymb. Involucre scales mostly in a row, con- 

 taining 12 or more flowers of a pure white. Aug. Sept. 



16. E. AROMATicuM. Aromatic Eupatorium. 



St. rough, pubescent, corymbose at summit ; Ivs. petiolate, opposite, sub- 

 cordate, lance-ovate, acute, 3-veined, obtusely serrate, smoothish ; invol. simple, 

 pubescent. — A handsome species, in low woods, Mass. to La. Whole plant 

 slightly pubescent, about 2f high. Leaves 2 — 4' long, | as wide, on petioles 

 less than an inch long. Heads of the flowers large, 10 — 15-flowered, white and 

 aromatic, in small corymbs. Scales about equal. Aug. Sept. 



17. E. sEROTiNUM. Michx. 



St. puberulent, diffusely branched ; Zrs. petiolate, lance-ovate, acute, sharp- 

 ly serrate, tripli-veined, nearly glabrous ; corymbs compound ; kds. 12 — 15- 

 flowered; scales 10 — 12, scarious-edged, very pubescent. 111. Mead, to Ga. 

 Stem 4 — 6f high, somewhat paniculate above. Leaves 4 — 6' by i — li', upper 

 ones nearly entire, and somewhat scattered, lower ones opposite, with large, 

 irregular serratures. Sept. Oct. 



5. MIKANIA. Willd. 



In honor of Professor Mikan, of Prague. 



Flowers all tubular ; involucre 4 — 6-leaved, 4 — 6-flowered ; recep- 

 tacle naked ; pappus capillary, simple, scabrous ; anthers partly ex- 

 serted ; achenia angled. — Mostly climbing herbs. Lvs. opposite. 



M. scANDENS. Willd. Climbing Boneset. 



St. smooth ; lvs. cordate, repand-toothed, acuminate, the lobes divaricate, 

 rather unequal ; hds. in pedunculate, axillary corymbs. — A climbing plant of 

 wet thickets, Mass. ! to Ga., rather rare. Every part smooth. Leaves 2 — 3' by 

 1 — 2', on petioles 1 — 2' long, apex tapering to a long point. Branches short, 

 nearly naked, each bearing a small corymb of whitish, or pink-colored flowers. 

 Aug. Sept. 



6. CONOCLINIUM. DC. 



Gr. Kcovos, cone, k'Xivtj, bed or receptacle. 



Heads many-flowered ; receptacle conical. Character otherwise as 

 in Eupatorium. — %- Herbaceous or suffruticose. Lvs. opposite^ petiolate^ 

 serrate. Fls. blue or purple., in croivded corymbs. 



