CATALOGUE. I47 



4 Minutely canescent, mucli branched ; leaves rigid, channeled, pin- 

 nately lobed with hooked spiny-pointed teeth; involucre obconical; the 

 scales viscid-pubescent, tips squarrose.— (i)je^ena viscosa, Nutt.) Virginia 

 Mountains, Humboldt Valley, and liolmes Creek Valley, Nevada; 6,000 feet 

 elevation ; September. (524.) 



5. Minutely canescent ; leaves oblanceolate, entire, mucronate ; head 

 rather large; scales lanceolate, scarcely spreading.— Ridge near Parley's 

 Park, Utah ; 7,000 feet altitude ; July. A single immature specimen. It is 

 very nearly the form called Dieteria incana by Torrey and Gray. (525.) 



DiPLOPAPpus EEicoiDES, T. & G. Stems 2-6' high, tufted and 

 branching from the suffrutescent base, canescent with exceedingly minute 

 appressed hairs ; leaves narrowly spatulate or linear, 2-6" long, crowded, 

 appressed or spreading, rigid, shghtly strigillose, gland ular-puberulent and 

 conspicuously ciliate with hispid bristles, often bristle-tipped ; heads terminal, 

 sohtary, rather small ; involucral scales loosely imbricated in about 3 series, 

 linear-lanceolate, acute, the narrow scarious margins slightly lacerate-fringed 

 towards the tip; rays rather short, white; outer pappus inconspicuous; 

 achenia pubescent. — Colorado to New Mexico and Northern Mexico. Rocky 

 bluffs near Great Salt Lake, growing in thick patches ; 4,500 feet altitude ; 

 May, June. (526.) 



DiPLOPAPPUS ALPINUS, Nutt. Stems 4-6' high, several from a woody 

 perennial base, naked toward the summit, webby-pubescent, becoming 

 smoothish; leaves crowded, rigid, oblong-linear, 1-nerved, 3-6" long, mucro- 

 nulate, minutely serrulate, canescent with fine pubescence and minute glands ; 

 heads rather large ; involucral scales in 2-3 series, somewhat appressed, 

 lanceolate, acute, glandular-puberulent, the scarious margins fringed; rays 

 long ; achenia silky- villous ; outer pappus very evident. — Montana (Wyeth ;) 

 Southern Idaho, (Burke.) Rocky ridges between the Pah-Ute and East 

 Humboldt Mountains; 5,500 to 6,000 feet elevation; June, July. (527.) 



Eeigeeon Canadadense, L. Canada to Oregon, and south to Texas. 

 Naturalized nearly throughout the world. Truckee Meadows, Soda Lake 

 and Ruby Valley, Nevada ; 4-6,000 feet elevation. (528.) 



Eeigeeon compositum, Pursh. Stems 2-6' high, several from a slender 

 perennial rootstock, scape-like or with a few leaves near the base and one or 

 two linear bracts higher up ; leaves long-petioled, hirsute, 2-3 times ternately 

 divided, lobes oblong-linear, obtuse ; heads single ; involucral scales hirsute. 



