292 DESCRIPTIONS OF NEW SPECIES 
icaule at the base; capituli large, subcorymbose, about three to five, on short 
and nearly naked peduncles; involucrum loosely imbricated, sepals nearly 
equal, linear-lanceolate, acute, somewhat spreading; achenium rather villous.— 
An alpine species growing with the above, but at a lower elevation. Root 
creeping; stem robust, about a foot high; terminating in a short raceme, or 
small corymb, glutinous pubescent above, as well as the sepals, which are 
leafy. Lower leaves spathulate-lanceolate; those on the stem few and rather 
remote, the lowest nearly half a foot long, the uppermost scarcely an inch, and 
cordate-lanceolate, amplexicaule; one or two small leaves on the peduncle, 
which is scarcely an inch long; leaves of the involucrum about equal with the 
disk, about two series. Rays bluish-purple, as long as the disk, fifteen to 
twenty-five, the terminal capitulum much larger. Pappus brownish, scabrous, 
rather long and abundant.—F lowering in August. Evidently allied to Pursh’s 
A, peregrinus, but the stem is pubescent below and viscid above, and the leaves 
amplexicaule. 
Aster * pauciflorus. Involucrum hemispherical, sepals very viscid, acumi- 
nate, nearly equal, about two series, foliaceous, and somewhat spreading ; 
rays few, pale purple. A genuine alpigenous Aster, no Tripolium. Allied 
to the preceding, but a small, slender plant. Tripolium pauciflorum, (NEEs.) 
—In the Herbarium of the Academy of Natural Sciences, Philadelphia. 
Aster * denudatus, stem erect, at length almost scapiform, pubescent above; 
radical leaves lanceolate or spathulate, rarely subdenticulate, smooth and cori- 
aceous, scabrous on the margin, ciliate at base; stem leaves very small, linear- 
lanceolate, amplexicaule; branchlets usually one-flowered, fastigiate, forming 
a wide corymb; involucrum short, imbricate, outer sepals foliaceous, oblong, 
obtuse, the inner somewhat acute; achenium nearly smooth, acute at base.— 
Has. In arid and dry grassy plains in the Rocky Mountains, near Lewis’ 
River, about latitude 42°, not uncommon. Root creeping. Stem twelve to 
sixteen inches high, clothed more or less to the base with small leaves; branches 
of the corymb elongated, leafy, mostly one-flowered, margins of the leaves very 
rough, ciliate with minute hooked bristles; radical leaves mostly lanceolate, on 
the suckers spathulate and obtuse. Capituli about the size of those of Erige- 
ron alpinum. Involucrum shorter than the disk. Rays rose-purple, thirty 
to forty. Pappus bright brown, scabrous. Achenium compressed, a little 
pubescent, almost stipitate at the base! 
