222 POLYGONACEAE 



sessile, about 2 mm. long; perianth 2 mm. long; outer lobes oval, obtuse, the 

 inner elliptic or oblong. E. fruticosum A. Nels. Sand: s Utah. Son. S. 



58. E, idahoense Rydb. Shrub, 4-6 dm. high; branches tomentose, erect; 

 leaves 2-3 cm. long, short-petioled; blades oblanceolate, white-tomentose beneath, 

 loosely floccose and glabrate above; involucres in the lower forks ped uncled, 

 turbinate, about 3 mm. long; perianth about 2 mm. long, glabrous. Hills: Ida. 

 Subrnont. Jl. 



59. E. orendense A. Nels. Stems white-tomentose, 7-15 cm. long; leaves 

 numerous, 1-3 cm. long, petioled, white-tomentose on both sides; lower in- 

 volucres with peduncles nearly 1 cm. long, erect; involucres turbinate, about 3 

 mm. long; perianth 2 mm. long; lobes oblong, obtuse. Dry hills: Wyo. Sub- 

 inont. Je-Au. 



60. E, lagopus Rydb. Stems scape-like, about 3 dm. high, floccose, trichoto- 

 mous; leaves crowded on the ends of the branches of the caudex, spatulate, 

 2-3.5 cm. long, tomentose on both sides; bracts subulate; involucres turbinate, 

 tomentose, 3-3.5 mm. long, those of the lower forks peduncled; lobes triangular; 

 perianth golden yellow, 2.5 mm. long, glabrous; segments eUiptic, the outer 

 slightly larger; filaments pubescent below; achenes glabrous. Plains: Wyo. 

 Plain. 



61. E. Thompsonae S. Wats. Caudex woody, cespitose; branches tomen- 

 tose; leaves long-petioled ; blades broadl}^ oblong, 3-4 cm. long, acute at each 

 end, glabrous above, white-tomentose beneath; peduncle 2-3 dm. high, glabrous; 

 involucres sessile, strongly 5-angled, 3-4 mm. long, glabrous; lobes short-ovate; 

 perianth glabrous, 2-3 mm. long; lobes subequal, oval. Sand cliffs: s Utah. 

 Son. 



62. E. campanulatum Nutt. Branches short; peduncle 1-3 dm. long; 

 leaves basal, petioled; blades tomentose on both sides, but less densely so above; 

 inflorescence with ascending branches; involucres campanulate, 2-2.5 mm. long, 

 glabrous or nearly so; perianth about 2 mm. long. E. snbulosum M. E. Jones. 

 Dry hills and plains: Neb. — Colo. — Utah. Plain — Subrnont. Je-Au. 



E. campanulatum X multiceps. Like E. multiceps in habit, pubescence, and leaf- 

 form, but the panicle is tristichous-cymose as in E. campanulatum and the flowers yellow. 



Neb. 



63. E. brevicaule Nutt. Leafy branches short; scapes 1-3 dm. high, soon 

 glabrous; leaf-blades 4-7 cm. long, densely white-tomentose beneath, loosely 

 floccose and greener above; involucres about 3 mm. long, campanulate, glabrous, 

 angled; lobes ovate, acutish; perianth campanulate, 2-2.5 mm. long, glabrous; 

 lobes oval, obtuse. Dry hills and plains: Mont. — -Colo. — Utah. Plain — Sub- 

 rnont. Je-S. 



E. chrysosepalum X brevicaule. Like E. brevicaule, but the leaves broader and the 

 branches of the inflorescence bearing capitate clusters, with somewhat tomentose involu- 

 cres. Utah. 



64. E. micranthum Nutt. Scape 1-3 dm. high; leaves 4-8 cm. long, 

 densely white-tomentose beneath, less densely so above; involucres turbinate- 

 campanulate, 3 mm. long; lobes ovate, acutish or obtuse; perianth 2 mm. long; 

 lobes oval, obtuse. Hillsides: Utah— Ida. Subrnont. Je-Jl. 



E. medium X micranthum. The branches of the inflorescence bearing capitate clus- 

 ters of more tomentose involucres. Utah. 



E. chrysocephalum x micranthum. Like the last hybrid, but leaves rather densely 

 tomentose above. Utah. 



65. E. contortum Small. Scape 1-2 dm. high, tomentulose; leaves thick, 

 clavate, about 1 cm. long, strongly revolute, tomentose on both sides; involucres 

 turbinate, glabrous, 2 mm. long; lobes ovate; perianth 2-2.5 mm. long; lobes 

 essentially equal, oblong-cuneate; fruit glabrous. Dry hills: w Colo. Son. 

 My. 



66. E. spathulatum A. Gray. Scape 2-3 dm. high; leaves all near the 

 base, petioled; blades spatulate or oblanceolate, densely white-tomentose on 



