570 POLYGON ACE.E ERIOGONUM 



shrubby below, much branched: leaves oblong- to obovate-spatulate, 1-2 

 inches long, on slender petioles, white- tomentose below, green and glab- 

 rate above: peduncles 6-15 inches high, naked, bearing a simple umbel of 

 3-10 naked rays subtended by a whorl of leaves : involucres deeply lobed, 

 the lobes shorter than the turbinate tube: flowers yellow or yellowish, 2-3 

 lines long, glabrous. Dry ridges, Oregon to California and the Rocky 

 Mountains. 



E. Tolmieanum Hook. Fl. 134. E. umbellatum var. monocephalum 

 T. & G. Branches short and depressed, shrubby below, denly cespitose : 

 leaves ovate, 3 lines long, narrowed to short petioles, glabrate above : 

 peduncles 2-4 inches high, bearing a whorl of leaves above the middle and 

 a single large globose head of one or more small involucres : flowers yellow, 

 the base abruptly narrowed and stipiform. High mountains, Washington 

 to California. 



E. montaiiniii. Stems depressed and diffusely much branching, 6-10 

 inches long shrubby and rooting at the nodes : leaves obovate to oblong, 

 often acute, short-petioled, 3-6 lines long, whiter tomentose beneath, green 

 and glabrate above: peduncles 1-3 inches long, naked bearing a simple um- 

 bel of 3-10 short naked'rays subtended by a whorl of leaves : involucres 

 loosely woolly the linear lobes longer than the turbinate tube : flowers 

 yellow, about 2 lines long, gradually attenuate to a stipe-like base, glabrous. 

 On the highest peaks of the Cascade Mountains. 



E. croceum Small Bull. Torr. Bot. Club xxv, 43. Shrubby and 

 spreading below 4-12 inches long, the branches often tufted leaves cluster 

 ed at the ends of the shoots, oval or orbicular- oval, 6-9 lines long obtuse 

 tomentose or glabrate above, abruptly narrowed to a stout petiole shorter 

 or longer than the blade: peduncles erect, 4-8 inches high, usually naked 

 except a bract near the middle, bearing a compound umbel subtended by a 

 whorl of leaves: involucres thinly tomentose, the somewhat lanceolate ac- 

 ute lobes longer than the broadly turbinate tube: flowers golden yellow, 

 about 3 lines long, narrowed into a long stipe-like base. In the mountains 

 of eastern Oregon and Idaho. 



E ternatnm. Stems short and densely cespitose, woody, 1-2 inches 

 long, densely leafy : leaves obovate to spatulate or oblong, obtuse, narrowed 

 below to a short winged petiole, densely white. tomentose both sides when 

 young, becoming green and glabrous above, 6-10 lines long: scapes 4-12 

 inches high, densely floccose with white wool when young, becoming glabr 

 rate in age, bearing a 4-rayed umbel subtended by a whorl of linear bracts 

 otherwise naked : central ray short, with a single naked involucre, the other 

 3 longer, with 1-3 involucres subtended by linear bracts : involucres some- 

 what funnelform. about 6 lines high, tomentose, few-flowered, the short 

 erect teeth less than a line long: sepals yellow, a line long, oval to obovate. 

 On gravelly bars along streams near Waldo, southern Oregon. 



E. stellatum Benth. Tans, Linn. Soc. xvii, 4C9. More or less tomen- 

 tose : stems diffuse and leafy :leaves ovate-Rpatulate to oblanceolate : pedu- 

 ncle naked, 6-12 inches high, bearing an umbel of 2-4 mostly elongated 

 rays which are usually and often repeatedly divided in a cymose manner, 

 the nodes and lateral rays all leafy-bracted : flowers yellow, about 3 lines 

 long, the base attenuate and stipe-like. In the mountains, Oregon to 

 California. 



Var. bahiaeforine Watson Proc. Am. -cad. xii, 257. Leaves most- 

 ly small, often densely tomentose both sides: umbel very compound. 

 With the type. 



E. heracleoides Nutt. Stems short and woody at base : leaves narrowly 

 oblanceolate with revolute margins densely tomentose beneath somewhat 



