570 POLYGONACEiE ekiogonum 



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

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

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

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

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

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

 Mountains. 



E. Tolmleannm Hook. Fl. 134. E. umbellalum var. monoce^halum 

 T. & O. Branches short and depressed, shrubby below, densly 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 ormore small involucres : flowers yellow, 

 the base abruptly narrowed and stipiform. High mountains, Washington 

 to California. 



E. montannm. 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, gi'een 

 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. crocenm 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 sidles 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 hy 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. stellatnm Benth. Tans, Linn. Soc. xvij, 4G9. More or leas tomen- 

 tose : stems diffuse and leafy :leaves ovate-spatulate 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 

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

 California. 



Var. bahiseforme Watson Proc.'Am. -cad. xii, 357. Leaves most- 

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

 With the type. 



E. }ier.aQleoldes Nutt. Stems short and woody at base: leaves narrowly 

 flblanoeolate yvit^ rpyojBte margins densely tomentose beneath somewhat 



