150 
BOTANY. 
Silver Creek Cailon in the Wahsatch ; 6,000 feet elevation ; July. In appear- 
ance much Hke E. acre, but it has a denser and softer pubescence and more 
numerous stems, and, as noticed by Nuttall, it lacks the tubular pistillate 
flowers of that species. (536.) 
Erigeron Bellidiastrum, Nutt. Annual ; stem corymbosely much 
branched and leafy throughout, like the leaves densely hirsute-pubescent ; 
radical leaves with slender petioles, entire and oblanceolate, or sometimes 
pinnately 3-5-lobed ; cauline ones sessile, oblong-linear or linear-spatulate ; 
heads few or many, rather small; involucre hirsute-canescent ; rays very 
many, (60-70,) w^hite or pale red, narrowly linear, twice or nearly thrice as 
long as the involucre ; achenia slightly pubescent ; pappus plainly double, the 
outer of minute squamellate setas. — Nebraska to the Eio Grande ; Mt. David- 
son, Nevada, (Bloomer.) Stream banks and meadows from the Truckee to 
the Wahsatch ; 4,500-5,000 feet elevation ; May-August. The outer pappus 
has been strangely overlooked ; it shows plainly in 246 Hall & Harbour. (53 7.) 
Erigeron macranthum, Nutt. Stems 9-30' high, several from a peren- 
nial somewhat creeping rhizoma, mostly smooth or slightly hairy, leafy to the 
summit ; leaves ciliated and sometimes more or less pubescent ; radical ones 
oblong-spatulate, petioled, 2-4' long, 6-8" wide ; the cauline shorter, oblong 
or broadly ovate-lanceolate, partly clasping; heads several, (3-13,) corymb- 
osely arranged on long peduncles, very large, with the very narrow and ex- 
ceedingly numerous purplish rays often nearly 2' broad ; involucre of many 
very narrow Hnear-acuminate herbaceous glabrous or glandular scales ; achenia 
2-3-nerved, slightly hairy; outer pappus of short slender setse.— Saskatchewan 
to Utah and New Mexico. Wahsatch and Uinta Mountains ; 6-8,000 feet 
altitude; July. (538.) 
Erigeron glabellum, Nutt. Stems 9-18' high, single or few from a' 
short erect caudex, shnple or sparingly corymbose at the summit, pubescent 
or nearly hispid ; leaves sometimes glabrous but commonly pubescent, entire 
or sparingly toothed ; radical ones spatulatc, tapering into a long petiole, 2-4' 
long, 4-6" broad; the cauHne scattered, oblong-lanceolate, the uppermost 
linear, sessile and partly clasping ; heads few, large, 10-15" broad, the rays 
very narrow and numerous ; involucre pubescent or somewhat hirsute; ache- 
nia and pappus as in the last.— An unsatisfactory species, very near the last, 
and passing into it by such forms as Yar. 7noUe, Gray, Proc. Phil. Acad., 
March 1863, p. 64. Alaska and Mackenzie River to Oregon, and eastward 
