AND G?ENERA OF PLANTS. 333 



shorter than the rest. — Perennial, alpine, tuberous rooted plants, with some- 

 what the habit of Arnica. Stem and lanceolate, serrated leaves smooth or 

 ^ lanuginous, the former one or few-flowered, subracemose. 



Homopappus *Inuloides; leaves lanceolate, subserrulate, softly lanuginous ; 

 stem one or few-flowered; sepals nearly equal, lanuginous; rays three-toothed, 

 forty to fifty ; achenium subsericeous. 



Hab. In the moist, open, grassy plains of the Rocky Mountains, towards the sources of the 

 Platte. From three or four inches to a foot high. The root a dark, turbinate tuber, clad, at the 

 summit, with numerous fibrous, reticulated vestiges of former years' growth. Leaves lanceolate, 

 often sparingly cartilaginously serrulate, the primary ones smooth ; the rest of the plant, as well as 

 the involucrum, softly lanuginous with a long, white, loose, woolly pubescence. Stem leaves ses- 

 sile, the lower much attenuated below. Capitulum hemispherical ;8 the involucrum flat, and its 

 sepals nearly equal. Rays oblong, three-toothed, shorter than the disk, between forty and fifty ; 

 the discal florets one hundred and twenty, or more, small, tubular, shortly five-toothed; style ge- 

 nerally included. Leaves two to four inches long, a quarter to half an inch wide. 



Homopappus *multiJlorus; stem and petioles deciduously lanuginous ; flowers 

 racemose, branchlets one or few-flowered; leaves lanceolate, serrate, acute, al- 

 most coriaceous, the cauline linear, small and sessile; capituli hemispherical, 

 pedicellate; sepals oblong, in about two rows; rays twenty to twenty -five; 

 achenium subsericeous. Donia lanceolata? Hook., Vol. II., p. 25. 



Hab. Prairies on the east and west side of the Rocky Mountains. From six inches to two feet 

 high. Allied to the preceding, but much larger, the leaves at length, or from the first smooth, 

 sharply and pungently serrulate ; rays oblong, slightly three-toothed, longer than the wide disk. 

 Involucrum almost flat, slightly pubescent, a little leafy externally, shorter than the pappus, which 

 is slender. Flowers about the size of a Daisy. Several stems from the same root, with leaves 

 sometimes so small as to appear almost as naked as scapes. Radical leaves four to five inches 

 long, attenuated into long petioles. Root tap- shaped, crowned with numerous fibrous vestiges of 

 former leaves. Stem sometimes only three-flowered, sometimes with many one to two-flowered 

 branches, from near the base to the summit; occasionally subdecumbent. 



PYRROCOMA. (Hooker.) 



Pyrrocoma *radiata; smooth, leaves spathulate-obovate, cauline ovate-lan- 

 ceolate, apiculate, serrate, amplexicaule, radical attenuated, entire, as well as 

 the lower ones; flowers few, very large, fastigiate, axillary and terminal, sub- 

 VII. — 4 I 



