570 POLYGONACEZ 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 
nee long, glabrous. Dry ridges, Oregon to California and the Rocky 
Mountains. 7 
E. Tolmieanum Hook. Fl. 134. KE. umbellatum var. monocephalum 
T. & G. Branches short and depressed, shrubby below, densly cespitose : 
leaves ovate, 3 lines long, narrowed to short petioles, glabrate above: 
pedunc les 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. montanum. 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 8-10 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-Jike base, glabrous. 
On the highest peaks of the Cascade Mountains. 
E. eroceum 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 tban 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 ternatum. 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, 409. More or less 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 aut often repeatedly divided in a cymose manner, 
the nodes and lateral rays all leafy-bracted: flowers yellow, about 3 lines 
long» the base attennate and stipe-like. In the mountains, Oregon to 
alifornia, 
Var. bahieforme 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 
