308 DESCRIPTIONS OF NEW SPECIES 



^. t Rays of the capitulum not very numerous, pappus mostly simple. 



(ASTEROIDEA.) 



Erigeron *Jilifolium; can escently villous and somewhat hirsute; root woody, 

 sending up many low, erect stems; leaves long and filiform, flowers corym- 

 bose, white ; sepals acute, short ; floral rays about twenty-five ; achenia smooth. 

 Diplopappus filifoliusl (Hook. Flor. Bor., Vol. II., p. 21,) but the rays are not 

 yellowish. 



Hab. In the Rocky Mountain range, in Oregon. Stems about eight to twelve inches. Leaves 

 two to three inches long, narrow as those of the pine, on the young or infertile branches crowded. 

 Rays about the length of the disk, few. Pappus simple, the bristly rays about twenty-five. Al- 

 lied to E. Afontevidense, but not shi'ubby. 



Erigeron radicatus. Hooker, 1. c. 



Hab. Blue Mountains, Oregon. A very dwarf, almost ctespitose species, with a short hirsute 

 involucrum, and very short, white rays. Pappus simple, of about ten to twelve, very slender, 

 scarcely scabrous bristles. 



_ Erigeron *nanum; dwarf and hirsute, leaves linear subspathulate, stem one- 

 flowered, nearly naked ; sepals lanceolate, hirsute ; rays white, shorter than the 



disk; achenium pubescent; rays of the pappus barbellate, about fifteen. 



Hab. In the Rocky Mountains. Resembles the preceding, but has hirsute leaves, and a differ- 

 ent achenium and pappus. 



Erigeron *pedatum; smooth, caespitose ; primary leaves simple or trifid, after- 

 wards pedate, unequally five-cleft; petioles elongated, strongly ciliate; scapes 

 numerous, one-flowered ; capitulum small, sepals acuminate, linear, a little hir- 

 sute; rays about the length of the disk; achenium pubescent. 



Hab. On the gravel bars of small streams to the east of Walla-Walla, in Oregon. Nearly allied 

 to E. trijidus, but very glabrous, and somewhat succulent; the flowers, also, numerous, and less 

 than half the size, with the involucrum nearly smooth. Rays pale rose. Achenium somewhat 

 sericeous; pappus of about twenty very slender, almost entire rays. 



1 1 Rays rather few, pappus double in ray and disJc. 



Erigeron corymbosum; minutely pubescent, somewhat canescent; many stems 

 from the same root, erect and low, terminating in a few-flowered corymb ; leaves 

 lanceolate-linear, sessile, entire and acute; sepals hispid, acute; rays blue, a 

 little longer than the disk, (about thirty;) achenium nearly smooth, and striate. 



