300 BOTANY. 



tending the umbel ; passing into Var. angustifolium, T. & G., with sub- 

 linear leaves and a simple or compound umbel. East Humboldt Mountains, 

 Nevada; 7-10,000 feet altitude; July, August. (1,011.) 



Eeiogonum umbellatum, Torr. T.S^ G., I. c, p. 160. A span .to a foot 

 high, woolly, tomentose or webby ; sterile branches decumbent or creeping, 

 often stolon-like, loosely ceespitose, fasciculate-leafy at top ; leaves obovate- 

 spatulate and oval, narrowing to a petiole, white-woolly beneath ; peduncles 

 scapelike, leafless excepting the involucre of bract-like leaves subtending the 

 simple or rarely subcompound umbel; involucre deeply 6-8-cleft, many- 

 flowered ; calyx very glabrous, yellow or sometimes white, the segments 2-3- 

 times longer than the slender stipe ; filaments and ovary as in the last ; 

 cotyledons nearly orbicular, a little shorter than the scarcely incurved 

 radicle. — Nebraska to Northern Texas and west to Oregon and California. 

 Frequent in the mountains throughout Nevada and Utah; 6-10,000 feet 

 altitude; June-September. (1,012.) A form is not rare with green and 

 glabrate or almost glabrous leaves and peduncles. East and West Humboldt 

 Mountains, Nevada; 7-9,000 feet altitude. (1,013.) 



Var. MONOCEPHALUM, T. & Gr. Dwarf, depressed, csespitose ; leaves 

 glabrate above or on both sides, the blade l-¥ long ; scape i-3' high, slender, 

 bearing 2-4 capitate involucres with usually 1-3 bracts, or a single larger 

 one, usually naked ; flowers smaller. — Oregon and California. On peaks of 

 the East Humboldt and Clover Mountains, Nevada, and in the Uintas; 

 9-11,000 feet altitude; August, September. (1,014.) 



Eeiogonum (Pseudo-umbellata) Lobbii, T. & a.; /. c, p. 162. Peren- 

 nial, low, csespitose, hoary at first with a very soft webby tomentum; leaves 

 crowded upon the thick caudex, subrounded, 1-2' long, contracted abruptly 

 into a usually longer petiole, rather thick, sometimes glabrate above ; scape 

 a span high, with rarely a single leaf below ; umbel subcompound, dense, 

 stipitate, the verticillate leafy bracts obovate or lanceolate ; involucres cam- 

 panulate, l' long, 5-7-cleft; flower with a very short abruptly contracted base; 

 calyx 3" long, very glabrous, 6-parted, white or dull-yellow, the segments 

 ovate, nearly equal ; filaments villous below ; ovary very glabrous ; radicle 

 subinflexed, a little exceeding the rounded-obovate eccentric cotyledons.— 

 In the Sierras ; 8-11,000 feet altitude ; near Virginia City, Nevada, (^Stretch;) 

 6,500 feet altitude. 



Eeiogonum (Lachnogyna) acaule, Nutt. T. 8^ G., I c, p. 163. 



