AND GENERA OF PLANTS. 309 



Hab. Rocky Mountains, towards the Oregon. A very elegant and peculiar species, bearing 

 some affinity with E. speciosum. Covered with a short, dense, pubescence, and with the margins 

 of the leaves scabrous. Stem six to eight inches high. Corymb of three or four capituli. Pap- 

 pus brownish, the exterior of white and slender paleae. 



Erigeron * decumhens; somewhat glabrous below; root creeping; stem leafy, 

 somewhat decumbent, many from the same root; leaves long and linear, acute, 

 scabrous on the edge, attenuated below, the upper ones somewhat pubescent; 

 flowers in a corymb; branchlets one-flowered, slender, and often leafy; sepals 

 acuminate, hirsute; rays white, about fifty, twice as long as the disk; external 



pappus minute. 



Hab. With the above, of which, at first glance, it appears a variety, but differs in the numerous 

 rays and minute external pappus, as well as general habit. 



Erigeron ^ ocliroleucum; subcsespitose ; stem pubescent above; radical leaves 

 linear-sublanceolate, entire, crowded, smooth, those of the stem narrower, short, 

 and sessile ; stems one-flowered, scapoid or corymbose, and few flowered, the 

 branchlets long; sepals tomentose, canescent, lanceolate, acute; rays numerous, 

 about the length of the disk, (ochroleucous,) achenium pubescent. 



Hab. Plains of the Oregon. August. Allied to the preceding, but with much larger flowers 

 and rays; remarkable for the clustered root leaves, which, in the scapoid variety, resemble a tuft of 

 pine leaves, ordinarily three to four inches long, by about a line Avide, smooth and thick, much 

 like those of nn Armtria. Stem about a span, branchlets three to five, one-flowered, forming, in 

 stout plants, an irregular corymb. Rays of the pappus, in both ray and disk, very obviously dou- 

 ble, the external ring white and shining, internal, of about fifteen bristles. 



Erigeron *foliosum; rather hirsute and somewhat scabrous; stem simple, 

 erect, terete, attenuated, the summit corymbose; leaves oblong-linear, sessile, 

 entire, acute, crowded ; sepals lanceolate, pubescent, acute, in about two series, 

 and nearly equal; rays short, red, about thirty, achenia subhirsute. 



Hab. Near St. Barbara, in Upper California. Flowering in May. A very remarkable species: 

 the stem terete, full of leaves, one and a half to two inches long, and about two lines wide, diminishing 

 in size with the attenuation of the stem. Sepals lanceolate. Pappus double, the outer small, the 

 inner of many brownish rays. Stigma exserted, smooth, and nearly equally filiform in the ray; 

 obliquely truncate and slightly pubescent in the discal florets. The rays narrow, about the length 

 of the involucrum, of a full purple red. This species appears to be considerably allied to Core- 

 throgyne, but it has the achenium of Erigeron, somewhat prismatic, with three or four longitudi- 

 nal brown lines or nerves ; but the obtuse stigma appears to be an anomaly in the genus. The as- 

 pect of the plant is much that of an lister. (My specimens are too young to be satisfactory.) 

 VII. — 4 c 



