CATALOGUE. 
147 
4. Minutely canesceiit, miicli bmiiclied ; leaves rigid, channeled, pin- 
nately lobed with hooked spiny-pointed teeth; involucre obconical; the 
scales viscid-pubescent, tips squarrose. — {Dieteria viscosa, Nutt.) Virginia 
Mountains, Humboldt Valley, and Holmes Creek Valley, Nevada ; 6,000 feet 
elevation ; September. (524.) 
5. Minutely canescent ; leaves oblanceolate, entire, niucronate ; head 
rather large; scales lanceolate, scarcely spreading. — Eidge 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. & Gr. Stems 2-G' high, tufted and 
branching from the suffrutesccnt ])asc, canescent with exceedingly minute 
appressed hairs ; leaves narrowly spatulatc or linear, 2-6" long, crowded, 
ap])ressiO(l or spreading, rigid, shghtly strigillose, glandular-i^ubcrulent and 
conspicuously ciliatc 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 shghtly 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 betw^een the Pah-Ute and East 
Humboldt Mountains ; 5,500 to 6,000 feet elevation ; June, July. (527.) 
Erigeron 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.) 
Erigeeon 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, 
