Eriogonum. POLYGONACE.E. -. q 



Leaves rounded : very diffusely much-braiulie 1, ofleu gla- 

 brous : involucres and Howers very suiali. 50. E. Haiikyi 



Leaves oblauceolate : more erect and virgate, tonientose : 



involucres short, turbinate : bracts more produced. 5L E. (;i:\cii i- 



Leaves rounded : intricately much-braiuihed, tonientose : 

 involucres very small : Howers larger, tiie segments 

 broadly cuneate, retuse. 52. E. Pi.umatella. 



§ 1. Involucres herbaceous and nerveless, more or less hroadly turUnate (mosthi 

 2 lines long or more), 4 - ^-toothed or -lohed : bracts follaceous, indefinite 

 in number (2 to 5 or more). Mostbj perennial. — Kuekiogonl-.m, \Vai:soii. 

 * Involucres in a simple or compound umbel, sometimes single or capntate: jjeri- 

 anth attenuate to a more or less narrow and stipe-like base. Perennials 

 often woodij at base, with naked or leafij-bracteate peduncles ; leaves mostly 

 woolly, at least beneath ; filaments pubescent at base; ovary usually some- 

 what hairy above. — {^% Uaibellata, Ueiith., & PsEuuo-ujttiiELLAXA Torr. 

 & Gray.) ' 



-I- Involucres deeply lohed, the lobes becoming reflexed. 

 •H- Perianth villous or pubescent : involucre solitary, without bracts {rarely urn- 

 belled in n. 3) : loiv and cespitose, with yellow Jtowers, and leaves tonientose 

 both ' ' 



1. E. cSBSpitOSum, Nutt, Dwarf and densely matted, the short woody caudex 

 much branched and usually crowded with old leaves : leaves ovate- to obIon"-s])atu- 

 late, 2 to 6 lines long, densely white-woolly, rosulate : peduncles scape-like,°nake.l, 

 1 to 3 inches high, slender : lobes of the involucre linear-oblong, as long as 'the tur- 

 binate tube : flowers yellow, often tinged with purple, 11 to 3 lines long inchiding 

 the stipe-like base; lobes oblong-oval. — Journ. Acad. Philad. vii. 50,1. 8 • Torn 

 & Gray, Rev, Eriog. in Proc. Am. Acad. viii. 157. > • > • 



On mountain sides and in dry valleys from Northwestern Nevada to Wyoming Teriitory. 



2. E. Douglasii, Benth. Somewhat larger, stouter and more diffuse, the leaves 

 sometimes an inch lung : peduncles 3 or 4 inclies high, with a whorl of 4 to 6 ob- 

 lauceolate leaves in the middle. — DC. Prodr. xiv. 9 ; Torr. & Gray, 1. c. 



In Sierra Valley, Sierra County {Lemmon) ; Blue Mountains, Oregon, Douglas. 



3. E. sphaerocephalum, Dougl. Still more diffuse and leafy-stemmed ; leaves 

 usually narrower and linear-spatulate, less tomentose above and margins often revo- 

 lute : peduncles 2 to 4 inches long, with a central whorl of leaves and solitary in- 

 volucre, or the whorl subtending a 2 - 4-rayed umbel with the lateral rays also 

 bracteate: flowers bright yellow or yellowish, 2 to 4 lines long including the slender 

 stipe. — Benth. 1. c. 8 ; Torr. & Gray, 1. c. 



Northern California (rocky hills about Yreka, Greene) and Nevada to Washington Territory. 



E. THYMOIDES, Benth., is most nearly allied to this grouj), though with tlie short invohicral 

 lobes apparently always erect : dwarf, densely branching and woodv, with revolute-linear leaves 

 1 to 5 lines long; peduncles slender, 1 to 3 inches high, with a whorl of similar leaves in the 

 middle ; flowers densely long- villous, purplish, 2 or 3 lines long, with rather liroad lobes. — 

 Oregon (Union County, Cusick) and Washington Territory, Pickering, Lxjall. 



++ -H- Perianth glabrous, with elongated base : peduncles from a more or less dif- 

 fusely branched woody base: umbel simple or compound {involucre rarely 

 solitary in n. 4) : leaves not large, often glabrous or glabrate at least above. 



4. E. umbellatum, Torrey. More or less tomentose, at least the upper side of the 

 leaves glabrate : leaves obovate- to oblong-spatulate or o])lanceolate, an inch or two 

 long or often smaller, margins not revolute nor undulate : jjeduncles 3 to 12 inclu's 

 high or more, naked, bearing a simple umbel of 3 to 10 naked usually short rays, 

 subtended by a whorl of leaves : lobes of the involucre usually shorter than the 



