AND GENERA OF PLANTS. 291 
ciliate; rays numerous, rather long, three-toothed ; achenium nearly smooth.— 
Has. 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, where 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.—F lowering in August. In one specimen the leaves are longer, sub- 
lanceolate, slightly serrulate, and the sepals more acute. 
Aster *glacialis, 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.—Has. 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 involuerum 
glutinous above; leaves entire, radical lanceolate, long petiolate, all acute; cau- 
line oblong-lanceolate, scabrous, pubescent on the margin, dilated and amplex- 
