ERIOGONUM POLYGONACE A 569 
E. pyrolefolium Hook. Kew Journ. Bot. v, 395, t. 10. Caudex short 
and thick, sparingly branched: leaves thick, glabrous, round-obovate to oblong, 
3-9 lines broad, mostly abruptly attenuate into a short petiole, broad and 
villous at base: scapes smooth, 2-3 inches high, bearing a 2-bracteate umbel 
of 1-4 very shortly pedicellate sinuately-toothed nd villous involucres; 
flowers yellow, slightly villous at base, short-attenuate.On the high mountains 
Washington to California. 
Var. corypheum T. & G. More tomentose, with narrower leayes 
and smaller flowers. On the high peaks of the Cascade Mountains. 
E. thymoides Benth. A much branched undershrub 3-10 inches 
high: leaves linear to spatulate with revolute margins, 2-5 lines long, white- 
woolly: peduncles slender, 1-2 inches high, bearing a whorl of linear bracts 
below the middle and a solitary, several-flowered involucre at the summit: 
involucre 3-4 lines high deeply cleft, the lobes spreading or recurved at the 
tip: calyx attenuate and densely retrorse villous at base, 2-3 lines long, the 
segments glabrous above, pink to purplish, broad and rounded at the apex. 
In sterile rocky places on top of high hills, eastern Oregon and Washington. 
E. cespitosum Nutt. Journ. Acad. Philad. vii, 50, t. 8. A densely 
branehed undershrub: stems 2-4 inches long depressed or ascending, the 
branches usually crowded with leaves: leaves ovate-spatulate to oblong, 2-¢ 
lines long, densely white-woolly, crowded on the short branchlets: peduncles 
svape-like 1-3 inches long, slender naked: bearing a single several-flowered 
involucre: lobes of the involucre linear-oblong, as long as the turbinate tube, 
becoming reflexed: flowers yellow, often tinged with purple,pubescent, 143-2 
lines long. the base stipe-like, the lobes oblong-oval. On dry ridges, south- 
eastern Oregon to Nevada. 
E. Douglasii Benth. in DC. Prodr. xiv, 9. Shrubby and rather loose- 
ly branched at base; 4-10 inches high: leaves spatulate to linear-lanceolate 
alternate below to a petiole white-tomentose below, pubescent above, 6-14 
lines long; peduncles rather stout, 2-6 inches long, witha whorl of oblance- 
- olate leaves in the middle and a single many-flowered involucre: flowersjyel- 
low pubescent outside, about 3 lines long. In the Blue Mountains of Oregon 
to California. . . 
E. spherocephalum Doug]. Benth. 1. c. Shrubby and loosely bran- 
ched below, 6-10 inches high; leaves lanceolate to spatulate 6-14 lines long 
tapering below to a distinct petiole, often with revolute margins, densely 
white-woolly below, pubescent but green above; peduncles 2-6 inches Jong 
with a whorl! of lanceolate leaves usually above the middle and a single many- 
flowered involucre; outer flowers reflexed, thus forming a denseround head, 
yellow or tingediwith red or purple, pubescent outside, abort 3 lines long 
the oblong lobes longer than the stipe-like base. On barren idges, eastern 
Washington to California. 
E. tenue Small Bull. Torr. Bot. Club xxy. 41. Stems loosely bran- 
ching, 3-5 inches long, slender, shrubby’at base: leaves crowded at the 
ends of the branches, linear or nearly so, 6-12 lines long, the margins rev- 
olute, thinly tomentose: peduncles erect, 3-5 inches high, bearing a 
whorl of leaves in the middle and a single terminal involucre: lobes of the 
involucre linear oblanceolate, obtuse, shorter than the turbinate tube, 
spreading or reflexed : flowers pale}| yellow, glabrous, about. 5 lines. long 
narrowed below to a stipe-like base, its segments unequal, the outer ones 
oblong-obovate, notched at the apex, the inner ones spatulate, erose at the 
apex. In dry sterile; rocky places along tne Columbia river, eastern 
Oregon and Washington. 
E. umbellatum Torr. Ann Lyc. N. Y. 241 Stems depressed and 
