316 LXXV. COMPOSITtE. Conoclinium. 



♦ * ♦ Leaves opposite. Heads 8 — 2Q-flowered. 



13. E. PERFOLiATUM. ThoToughwort. Boneset. 



L/vs. 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. REsiNosuM. Torr. 



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

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

 sides ; corymJb fastigiate, compound ; Ms. 10 — 15-tlowered ; 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. AGERATOlDEs. Nettk-kaved Eupatorium. 



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

 acuminate, dentate, 3-veined, nearly smooth ; con/nibs 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 ; Ivs. 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 | — IJ', upper 

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

 irregular serratures. Sept. Oct. 



5. MI KAN I A. 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 Boncsct. 



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. Kcovoi, cone, K^ivr;, bed or receptacle. 



Heads many-flowered ; receptacle conical. Character otherwise as 

 in Eupatorium. — % Herbaceous or snffruticose. Lvs. opposite., petiolate., 

 serrate. Fls. blue or purple, in' crowded corymbs. 



