ERioGONUM POLYGONAGE^ 571 



glabrate above : peduncles stout 6-12 inches high with a whorl of leaves 

 near the middle umbel 1-11-rayed, sometimes simple, usually with some 

 or all of -the rays once or rarely twice divided : flowers yellow or whitish, 

 glabrous, about 3 lines long. On dry plains, eastern Washington to Nevada 

 and Utah. 



E. coinpositnm Benth. Trans. L,inn. Soc .xvii. 409. Stems decumbent 

 or ascending, 4-10 inches long, somewhat woody : leaves oblong-ovate, acute 

 or acutish, 1-3 inches long, cordate at base on petioles 2-8 inches long, den- 

 sely white- tomentOse beneath, green and flocculent above: peduncles stout, 

 naked,6-18 inches high, nearly glabrous: umbel of 6-10 more or less elonga- 

 ted rays, each bearing a short several-rayed umbellet, subtended by whorls 

 of linear-oblanceolate leaflets : flowers yellow to whitiSh or rose-color, 2-4 

 lines long, the stipe-like base short. On rocky banks, Brit. Columbia to 

 California and Idaho. 



* * Densely tomentose perennials with naked pe luncles : involucres 

 with 5 short erect' teeth: flowers small abruptly narrowed at base, 

 pubescent : achenes densely villous. 



E. acanle Nutt. T & G. Proc. Am. Acad, viii, 163. White-tomentose 

 and matted cespitose : leaves densely crowded upon the closely branched 

 caudex, oblong to linear with revolute margins, sessile, 2-3 lines long, 

 spreading from the imbricated base : involucres in heads of 1-5, among the 

 uppermost leaves, nearly sessile short, 3-5-toothed : flowers with broad 

 sessile base, hardly 2 lines long, the oblong segments equal : filamemts 

 pilose at base: ovary very tomentose with long wool. Sandy hills, Idaho 

 to the Kocky Mountains. 



E. minimum Small Bull. Torr. Bot. Club xxv, 47. Gray-canescent : 

 branches densely tuftefl, about 6 lines long : leaves densely imbricated and 

 crowded, the persistent ones of previous years black, the fresh ones gray, 

 spatulate, or almost terete by the strongly revolute margins, obtuse, dilat- 

 ed at base : peduncles ^rect, 1-3 lines high, simple : involucres solitary , 

 turbinate-campanulate a little more than a line high; flowers 1-2 lines 

 long, the"ae01aents unequal, the 3 outer oval, the 3 inner pbovate, all obtuse : 

 filaments villous at base. At high elevations in the Cascade Mountains 

 of Washington. 



E. pendulum Watson Proc. Am. Acad, xxiii, 265. White-tomentose 

 throughout: stems woody at base 1-2 feet high profusely branched: leaves 

 scattered, oblong-oblanceolate, 1-3 inches long, obtuse, subglabrate above : 

 inflorescence several times di- or trichotomous upon naked peduncles : pedi- 

 cels mostly elongated andnaked: involucres at first noddingi campanulate, 

 about 2 lines long, its deltoid teeth erect : flowers very small,densely tom- 

 entose, slightly exserted. On dry rocky plains, eastern base of the Coast 

 Mountains near Waldo, Oregon, 



§ 2 Involucres campanulate or short turbinate, not angled br 

 nerved, with 5 rounded erect teeth, pedunculate in diffuse repeat- 

 edly di- or trichotomous panicles : bracts not foliaceous, all tern- 

 ate, small, mostly trianglar and rigid: flowers not alternate at 

 base : ovary glabrous. 



* Annuals : leaves all radical or nearly so : involucres flowers and 

 achenes small. 



E. cernuum Nutt. Journ. iVcad. Phila. Ser. 2, 1162. Stem very short : 

 scape erect, usually much branched. 6 12 inches hi^h : leaves orbicular or 

 oblong-orbicular, less than an inch long obtuse or slightly apiculate, flat, 

 flqcoose-tomentose, especially beneath, petioled : inflorescence paniculate: 

 involucres campanulate, slightly more than half a line high solitary on 



