bbiogonum POLYGONACEiE 569 



E. pyrolsefolium 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; 

 Mowers yellow, slightly villous 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 high hills, eastern Oregon and Washington. 



E. ca? spit sum 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, 2-6 

 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: Mowers yellow, often tinged with purple, pubescent, lj£-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, 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. sphrcroeephaluin 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 mar-gins, 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. tenue 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 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 S 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 >long the Columbia river, eastern 

 Oregon and Washington. 



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



