348 DESCRIPTIONS OF NEW SPECIES 



mit of the root, and hid among the leaves. — Nearly allied to Parthenium, 

 though of the most dissimilar habit, and perfectly distinct. — (The name from 

 ^ia?MS, a clod, and ^irrov, a plant; in allusion to the depressed and csespitose 

 growth.) 



Bolaphyta alpina. 



Hab. In the Rocky Mountain range ; latitude about 42°, and seven thousand feet above the level 

 of the sea. On shelving rocks, on the summit of a lofty hill, near the place called the " Three 

 Butes" by the Canadians, towards the sources of the Platte. Flowering in June. Root fusiform, 

 stout and very long, sending off several closely-matted crowns of leaves. Leaves about an inch or 

 an inch and a half high, scarcely a line wide, linear and acute, attenuated below, coming out in 

 rosulate clusters, equally pilose on^ither side, without any visible vessels but the mid-rib, so that 

 the leaf appears nearly the same on either side. Capitulum sessile, or upon a very short and thick 

 peduncle, somewhat larger than that of Parthenium integrifolium, but still very similar. Scales 

 of the involucrum ten, five external, ciliate and pubescent al; the summit ; receptacular scales simi- 

 lar but narrow, also pubescent at the tips, each enfolding a male floret, with the five-toothed sum- 

 mit visible. Anthers dark brown, united, enclosing a very sniall style, with a simple, obtuse, 

 scarcely pubescent stigma. Radial florets ochroleucous, (as well as the discal) short and tubular, 

 appearing truncate, the border a little spreading and slightly crenulate, vdth scarcely any anterior 

 cleft. Stigmas not exserted beyond the short ligula, Achenium black when ripe, with a whitish 

 border. 



Parthenium integrifolium. \ 



Hab. In Arkansa. 



Subtribe ll.—HELIANTHEJS. {Less. Decand.) 



Division I. — Heliopside^. (Decand.) 



Zinnia * grandiflora; ill dwarf; leaves linear lanceolate, connate, scabrous 

 on the margin; stem much branched from the base; rays (yellow) very large, 

 orbicular-oval; scales of the involucrum rounded; palese fimbriate; discal fruit 

 with a single awn. 



Hab. In the Rocky Mountains, towards Mexico. — A very distinct and splendid species, appa- 

 rently perennial. The only specimen I have, (presented me by my friend, Dr. Torrey,) is scarcely 

 more than five inches high ; the stem somewhat hirsute ; leaves about an inch long, two to three 

 lines wide, three-nerved below; branches one-flowered ; involucrum of about three series of di- 

 lated, roundish scales. Rays yellow, orbicular, or widely oval, appearing cordate at base, and 

 there plaited, three-fourths of an inch wide; style of the ray filiform, smooth, exserted, bifid. Disk 

 apparently orange. 



