AND GENERA OF PLANTS. 291 



ciliate; rays numerous, rather long, three-toothed; achenium nearly smooth. — 

 Hab. On the highest summits of the Rocky Mountains, near the line of per- 

 petual snow, in 42°. About ten thousand feet above the level of the sea. Near 

 the summit of Thornberg's Ridge, v^here we made an ineffectual attempt to 

 cross the Northern Andes, in August, still deeply buried in snow. Allied ap- 

 parently to the A. repens of Humboldt and Bonpland. 



Root perennial, creeping, wiry and slender, sending up small clusters of de- 

 cumbent stems, three or four inches high, each mostly terminating in a single 

 capitulum, about half the ordinary size of that of A. alpinus. Radical leaves 

 very smooth, and somewhat coriaceous, rarely with two slight denticulations, 

 stem leaves three or four, lanceolate-linear, amplexicaule and acute, usually 

 somewhat ciliate. Capitulum hemispherical, involucrum of two series of nar- 

 row linear acute, herbaceous sepals, strongly pubescent on the margin, rather 

 shorter than the disk. Rays feminine, about forty, narrow linear, mostly 

 three-toothed, purplish-blue. Pappus scarcely scabrous, purplish; the hairs 

 slender. — Flowering in August. In one specimen the leaves are longer, sub- 

 lanceolate, slightly serrulate, and the sepals more acute. 



Aster *glacialisy stem erect, one-flowered, pubescent above, rather naked ; 

 leaves entire, smooth, somewhat three-nerved, the primary ones spathulate- 

 oblong, the rest lanceolate, acute, scabrous on the margin, cauline small, very 

 acute, amplexicaule; involucrum of nearly a simple series of linear, acuminate, 

 glandularly pubescent, brownish sepals ; rays rose-purple, three-toothed ; pap- 

 pus barbellate; achenium pubescent. — Hab. With the preceding, which it 

 much resembles. — Root perennial, not creeping, the stock rather thick and 

 undivided. Leaves wholly smooth, except the scabrous margin, after the first 

 spathulate ones, acute, attenuated below ; stem often as naked as a scape. The 

 calix quite viscid; the sepals much acuminated, of an uniform brown and 

 herbaceous colour, about the length of the disk. Rays oblong, broader and 

 shorter than in the preceding, about forty, somewhere about equal with the 

 disk. Pappus paler, much shorter than in the preceding, and distinctly bar- 

 bellated. 



Aster * integrifolius, stem pubescent, simple, erect, and with the involucrum 

 glutinous above; leaves entire, radical lanceolate, long petiolate, all acute; cau- 

 line oblong-lanceolate, scabrous, pubescent on the margin, dilated and amplex- 



