78 BUCKWHEAT FAMILY 



It is common around Yosemite Valley, often in forms indis- 

 tinguishable from E. stellatutn. 



3. E. incanum T. & G. Flowering stems numerous, 9 in. 

 or less high, from a dense mat of gray foliage. Leaves 

 oblanceolate or oval, Y\ to nearly 1 in. long, densely and 

 permanently white-woolly. Umbel of 5 to 10 slender branches 

 2 in. or less long, or the whole inflorescence reduced to a 

 small head in Alpine forms. Involucres with short erect 

 teeth. Flowers yellow, often tinged with red. — In decom- 

 posed granite at high altitudes: Sentinel Dome, Lake Tenaya, 

 Clouds Rest, etc. The type specimens came from the 

 Tuolumne River at 8000 to 10,000 ft. alt. 



4. E. marifdlium T. & G. Very much like E. incanum, of 

 which it is perhaps only a form. Foliage-stems less compact, 

 the mats therefore more open. Leaves ovate or oblong, 

 sometimes glabrous above. — High mountains, as in Tilden 

 Canon at 8200 ft. alt. 



5. E. stellatum Benth. Flowering stems 6 to 12 in. high, 

 from a loosely branched woody base. Leaves lanceolate, l /t 

 to 1 in. long, white-woolly at least beneath. Involucres in 

 usually compound umbels with whorls of leaf-like bracts at 

 the nodes. — Differs from E. umbellatum only in having the 

 branches of the umbel again divided. Snow Creek, at 6600 ft., 

 Glacier Point, and similar places. 



6. E. ursinum Wats. Flowering stems 6 to 15 in. high, 

 from short and thick very leafy basal branches. Leaves oval 

 or roundish, % to ^ m - l° n &> nearly as broad, white-woolly 

 beneath, greenish above. Umbel compound but very com- 

 pact, whole inflorescence V/i in. or less long, subtended by 

 many conspicuous bracts. Flowers very pale yellow. — Tahoe 

 district and northward, in the high mountains; to be expected 

 within our borders. 



7. E. ovalifolium Nutt. Plant forming a dense white mat 

 an inch or two high, from which arise naked simple flowering 

 stems 1 to 9 in. long, each terminating in a dense head of 

 flowers. Leaves oval or roundish, J4 in. or less long, per- 

 manently white-woolly on both sides, so densely compacted 

 as to hide the short thick foliage-stems. Flowers roseate, 

 white, or yellow. — Gravelly slopes in the Alpine Zone, as on 

 Mt. Dana. 



8. E. wrightii Torr. Stems woody, leafy, and much 

 branched below, the naked flowering shoots rising to 12 or 18 

 in. and bearing small clusters of rose-colored flowers. Leaves 

 oblanceolate, % to 1 in. long, with smaller ones densely clus- 



