AND GENERA. OF PLANTS. 287 



and small, nearly entire; panicle few-flowered, subfastigiate ; capituli pedicel- 

 late; scales of the involucrum linear lanceolate, acuminate; pappus white. — 

 Hab. On the shelving rocks of the Blue Mountains of Oregon. 



Obs. — A very remarkable species. Perennial, forming rigid dwarf suffruti- 

 cose tufts of very branching stems, scarcely a foot high, viscid, with a bitter, 

 highly aromatic resin. The larger leaves roundish-ovate, about an inch long, 

 those on the branches and upper part of the stem (as in some Asters) diminish- 

 ing to a fourth of that size, and numerous. Involucrum ovate, squarrose at 

 base. Flowers white? 



BRICKELLIA. (Elliott.) 



EuPATORiUM, but with the involucrum ovate, or hemispherical, of several se- 

 ries of loosely imbricated, usually striated scales, the inner scariose, the lower 

 spreading, with subulate leafy points. Florets ten to fifty. Achenia subcy- 

 lindric, with ten strise. Pappus pilose, barbellate, or scarcely scabrous. Re- 

 ceptacle naked. — Leaves opposite, and alternate above. Corolla purple or 

 white. Flowers corymbose, or clustered. 



Section I. Eubrickellia. — Involucrum squarrose at base; the scales rvith four 



prominent strim on each. 



BricTiellia cordifolia^ (Elliott,) leaves opposite, cordate, acuminate, dentate, 

 triply-nerved, pubescent beneath, above alternate; corolla and pappus more or 

 less purple; achenia pilose above. — Hab. In Georgia. 



BricTiellia grandiflora, leaves alternate, deltoid-cordate, acuminate, incisely 

 dentate towards the base, entire at the point, smooth on both surfaces, and co- 

 vered beneath with resinous atoms; flowers in fastigiate clusters, the upper 

 part of the stem branching; inner scales of the involucrum linear-lanceolate, 

 acute; pappus white, achenia smooth. — Eupatorium? grandijlorum. Hook. 

 Flor. Bor. Am., Vol. IL, p. 26. 



Hab. In the Rocky Mountain range, by streams, in gravelly places, and 

 west, to the lower falls of the Columbia. — Perennial. Stems many from the 

 same root, about twelve to fifteen inches high. The whole plant almost per- 

 fectly glabrous. Leaves alternate, sometimes almost opposite, approximate, on 

 longish petioles, deltoid-cordate, acuminate, coarsely and deeply toothed to- 



