ERIOGONUM POLYGONACE^E 569 



E. pyrolaefolium 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 Tillous at base, short-attenuate. On the high mountains 

 Washington to California. 



Var. coryphaeum T. & G. More tomentose, with narrower leaves 

 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 hi^h hills, eastern Oregon and Washington. 



E. caespitosum 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-C 

 lines long, densely white-woolly, crowded on the short branchlets: peduncles 

 scape-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, l.^j-2 

 lines long, the base stipe-like, the lobes oblong-oval. On dry ridges, south- 

 eastern Oregon to Nevada. 



E. Donglasii 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, with a 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. sphaeroceplialnni Dougl. Benth. 1. c. Shrubby and loosely bran- 

 ched below, 6-10 inches high; leaves lanceolate to spatnlate 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 long 

 with a whorl of lanceolate leaves usually above the middle and a single many- 

 flowered involucre; outer flowers reflexed, thus forming a dense round head, 

 yellow or tinged,- with red or purple, pubescent outside, abo r t 3 lines long 

 the oblong lobes longer than the stipe-like base. On barren idges, eastern 

 Washington to California. 



E. tenne Small Bull. Torr. Bot. Club xxv. 41. Stems loosely bran- 

 ching, 3-5 inches long, slender, shrubby at base : leaves crowded at the 

 ends of the branches, linear or nearly s"o, 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^i yellow, glabrous, about 3 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 the Columbia river, eastern 

 Oregon and Washington. 



E. umbellatum Torr. Ann Lye. N. Y. 241 Stems depressed and 



