^•^>-io<Jon,nn. rULYGONACE.E. 



Leaves roumled: very diirus..]y mucli-brancl.ol, oftc. nla- 



t^rous : involucres niuMloweis very small. ^ 50Env.irv, 



Leaves oblauceolate: more erect and virgate, ton.entose : ''"• 



"'^olucres short, turbinate : bracts more produced 51 Vmuuv 

 Leaves rounded: intricately much-branched, tmnenS • ^- «"•^^'"'• 



involucres very small : llowers larger, the segments 

 broadly cuneatcretuse. 52. E. P,,u«atella. 



§ 1. Involucres herbaceorts and nerveless, more or less broadly turbinate (mo^th, 

 2 lines lon,j or more), A-H-toothed or -lobed : bracts foliarrousindZ^^^^ 

 m number (2 to 5 or more). Mostl, perennial - EvLooo^"';, wXu 

 * Involucres m a simple or compound umbel, sometimes single or capitate ■ veri 

 anth attenuate to a more or less narrow and stlpe-uL baslpeLZ, 



1Zir:-'l "Vr' 'T --f"^ "■ ^^^fy-^racteatipedunclcs; I'^IZ^' 

 woolly, at least beneath ; Jilaments pubescent at base: ovar, usuallu so ml 

 f^J^^ry above. ~(U Umu.ll.xa, Uonth., & Vs^.o-viuZZZiZ. 



■i- Involucres deeply lobetl, the lobes becominy rcjlexed. 

 - P<^^<inth villom or pubescent: involucre solitary, without bracts (rarehj urn- 

 Mhslde^ ^'' ''^'"'"■'' '"'''' yelbno Jlowers, and leaves tolnenZe 



.HudM ;-uT^'^°f ""' n"^^- ^:T^ ""^ '^'''''^^ "^'-^tted, tl,e short woody caudex 

 ato, 2 to liues long, dense ywJnte- woolly, rosulate : peduncles scano-1 ike naked 

 1 to 3 inches Ingh, slender: lohes of the involucre linear-oblong, as lon^ as the tur! 

 .mate tul,o : 1 owers yellow, often tinged with purple, U to 3 li ,os lon^. nc hd . 

 the sfpe-l.ke base ; obes oblong-oval. -dourn. Acad. l>hilad. vii. 50. t. 8 : 'l' t 

 cV Uray, Jiev. hriog. in Proc. Am. Acad. viii. 1.57. v, u o , loir. 



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

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

 omet.mes an inch ong : peduncles 3 or 4 inches high, with a whorl of 4 to 6 ob 

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



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

 J.B. sphcerocephalum, Dougl. Still more diffuse and Icafv-stemiued ; leaves 

 ually narrower and hnear-spatulate, less tomentose above an.l margins often revo- 

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

 volucre or the whorl subtending a 2 - 4-nvye<l umbel with the lateral rays also 

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

 stipe. — Ijonth. 1. c. 8 ; lorr. & Gray, 1. c. 



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

 E. TUYMOinES, Benth., is most neariy allied to this group, thougli with the short involucral 

 lobes apparently always erect : dwarf, densely branching and'woodv.^vith rcvolu e n ar lea'S 

 1 5 hncs long; pedunc es slender. 1 to 3 inches high, with a whori of sin.ilar lea^^s i the 

 mid.llo ; flowers densely long-villous, purplish, 2 or 3 lines long, with rather broad lobes - 

 Oregon (Union County, Ctcsick) an.I Washington Territory. PickerTnff, Lyall. 



•H. -H. Perianth glabrous, with elongated base: pedunclrs from a more or le.<is dif- 

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

 solitary in n. 4): leaves 7iot large, often glabrous or glabrate at least above. 

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

 leaves glabrate : leaves obovate- to oblong-spatulate or ol)IanceoIate, an inch or two 

 long or often smaller, margins not revolute nor undulate : peduncles 3 to 12 inches 

 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 



