292 DESCRIPTIONS OF NEW SPECIES 



icaule at the base ; capituli large, subcorymhose, 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. — Flowering in August. Evidently allied to Pursh's 

 A. peregrinus, but the stem is pubescent below and viscid above, and the leaves 

 amplexicaule. ^ ^^^. 



Aster *pauci/lorus. 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 Natyiral 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. — 

 Hab. 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 oi Erige-' 

 ron dlpinum. 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 ! 



