AND GENERA OF PLANTS. 335 



A small, tufted alpine, only three or four inches high. Stems like scapes, bearing one or two small 

 leaves. 



Stenotus ccespitosus; somewhat csespitose or tufted; leaves linear-sublanceo- 

 late, smooth, three-nerved, scabrous on the margin; stems scapoid, one to four- 

 flowered; involucrum hemispherical, the membranaceous scales ovate, acute; 

 rays about twelve; achenium sericeous. Chrysopsis ccespitosus; Journ. Acad., 



Vol. VII., p. 34. 



Hab. Towards the sources of the Missouri and the Platte, in the range of the Rocky Mountains. 

 More than twice as large as the preceding. Root somewhat ligneous. Leaves very acute, those 

 of the stem two or three in number, wide, sessile, and somewhat lanceolate; peduncles very long. 

 Pappus white; achenium brightly and closely sericeous, linear-oblong. Stigmas much exserted. 

 Very nearly allied to the preceding. 



Stenotus * Armerioides; somewhat csespitose or tufted, caudex ligneous ; leaves 

 linear, slightly lanceolate, more or less glutinous, as well as the involucrum, 

 scabrous on the margin; stems almost wholly naked, scapoid, one to three- 

 flowered, peduncles very long, scales of the short involucrum broadly mem- 

 branaceous, oval, obtuse; rays about twelve; stigma lanceolate; achenium dense- 

 ly sericeous, about the length of the short white pappus. 



Hab. Towards the sources of the Platte, in the Rocky Mountain range, on shelving rocks. 

 About a span high, with a large, distinctly woody root, of great length. Leaves three or four 

 inches long, little more than a line wide, rigid and coriaceous, resinously viscid, in a slight degree 

 three-nerved, all linear, about two leaves on the stem ; peduncles two to three inches long ; the 

 stems appearing entirely like scapes. Involucrum imbricated in about two series, much shorter 

 than the florets. Stigma unusually thick and large, puberulous. Achenium very thickly covered 

 with silky hairs, as in the true species of Aplopappus. The plant, at first glance, has much the 

 appearance of an Armeria. Allied to tlie preceding, but perfectly distinct. 



§1 I. * OoNOPsis. — Involucrum small, ovate; achenium linear, pappus fulvous. 



Stenotus *multicaulis; dwarf, subcsespitose, many-stemmed; leaves linear, 

 radical obtuse, cauline acute ; stems slender, one to three-flowered ; flowers ses- 

 sile; involucrum ovate, lanuginous, scales acuminate; rays about eight; ache- 

 nium pubescent, linear. 



Hab. On rocks, on the western declivity of the Rocky Mountains. A remarkable species, forming 

 dense tufts, with leaves two to three inches long and about a line wide, the primary ones obtuse, 

 the rest acute, the upper ones pubescent. Stems many, scarcely rising more than an inch above the 

 leaves, slender like peduncles, terminating in one to three fastigiate flowers, which are sessile, or 



