150 BOTANY. 



Silver Creek Canon in the Wahsatcli ; 6,000 feet elevation ; July. In appear- 

 ance mucli like 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.) 



Eeigeeon Bellidiasteum, 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,) white 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 setae. — 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.) 



Eeigeeon maceanthum, 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 linear-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.) 



Eeigeeon glabellum, Nutt. Stems 9-18' high, single or few from a 

 short erect caudex, simple or sparingly corymbose at the summit, pubescent 

 or nearly hispid ; leaves sometimes glabrous but commonly pubescent, entire 

 or sparingly toothed ; radical ones' spatulate, tapering into a long petiole, 2-4' 

 long, 4-6" broad ; the cauline 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 Var. 7nolle, Gray, Proc. Phil. Acad., 

 March 1863, p. 64. Alaska and Mackenzie River to Oregon, and eastward 



