224 POLYGONACEAE 



high; involucres 2-2.5 mm. long, campanulate, tomentose; lobes rounded; peri- 

 anth campanulate, 2-2.5 mm. long; lobes unequal, the outer obovate, truncate 

 or emarginate, the inner elliptic. E. corymbosus divaricatus Torr. Plains: Colo. 

 N.M. Ariz. -Nov. Son. Jl-Au. 



77. E. Jonesii S. Wats. Shrubby; stem 3-8 dm. high, tomentose; leaves 

 scattered, petioled; blades 1-3 cm. long, densely white-tomentose beneath, floe- 

 cose above; inflorescence with ascending branches; the lowermost bracts some- 

 times foliaceous; involucres all sessile, or rarely the lower peduncled, tomentose- 

 villous, about 3 mm. long; perianth campanulate, about 2.5 mm. long; lobes 

 obovate. Arid regions: Ariz. -Utah. Son. -Submont. Jl-Au. 



78. E. corymbosum Benth. Shrub, 3-10 dm. high, with tomentose 

 branches; leaf -blades oval, 2-3 cm. long, 1-1.5 cm. wide, densely white-tomentose 

 beneath, loosely floccose above; inflorescence 0.5-2 dm. high, with ascending 

 branches; involucres sessile, tomentose, ^-2.5 mm. long, campanulate; perianth, 

 about 3 mm. long, campanulate; lobes elliptic, nearlv equal. Dry plains: Colo. 

 Utah N.M. Son. Je-S. 



79. E. salinum A. Nels. Low shrub, with shreddy bark; branches white- 

 tomentose, leafy; leaves narrowly lanceolate, mostly erect, white-tomentose 

 beneath, floccose above, 2-3 cm. long; inflorescence about 1 dm. high, flat- 

 topped, with short, spreading branches; involucres turbinate; lobes acute; peri- 

 anth-lobes obtuse or apiculate, the outer oblong-elliptic, the inner longer, obo- 

 vate. Saline plains: Wyo. Colo. Plain Submont. Je-Jl. 



80. E. effusum Nutt. Shrub, 2-5 dm. high; leaves short-petioled ; blades 

 linear-oblanceolate, 2-4 cm. long, 4-8 mm. wide, white-tomentose beneath, floc- 

 cose above, 3-10 cm. long, tomentulose; involucres short-peduncled, or the upper 

 sessile, 2 mm. long, tomentulose; lobes ovate; perianth campanulate, 2 mm. long; 

 outer lobes obovate, the inner elliptic. Dry plains and hills: Neb. N.M. 

 Utah Mont. Son. Plain Submont. Jl-S. 



81. E. microthecum Nutt. Low shrub, 2-6 dm. high; leaves scattered, 

 short-petioled; blades linear, oblong, or oblanceolate, densely white-tomentose 

 beneath, floccose above, 1-2 cm. long, 3-5 mm. wide; inflorescence 2-7 cm. long, 

 floccose, small; branches short, spreading or ascending-spreading; involucres, at 

 least those of the lower forks, peduncled, tomentulose, turbinate, 2.5 mm. long; 

 lobes rounded, scarious-margined ; perianth turbinate, 2.5-3 mm. long; lobes 

 obovate, rounded, truncate or even emarginate. E. myrianthum, E. intricatum, 

 E. heliochrysoides, and E. sarothriforme Gand. Plains and table-lands : Mont. 

 Neb. Colo. Ariz. Calif. Wash. Son. Plain Mont. Je-S. 



82. E. nebraskense Rydb. A low shrub, 2-3 dm. high; branches and 

 inflorescence tomentose; leaves short-petioled, oblanceolate, 2-3 cm. long, 

 densely white-tomentose on both sides; inflorescence less than 1 dm. high, tricho- 

 tomously or verticfllately branched; branches short, more or less spreading; 

 involucres tomentose, 2-3 cm. high, turbinate; lobes triangular; perianth rose- 

 colored, glabrous or slightly pubescent, 2. 5 mm. long; segments oblong to obovate; 

 fruit glabrous. Plains: w Neb. Jl. 



83. E. Simpson! Benth. Low shrub, 1^4 dm. high; leaves scattered; blades 

 1-2 cm. long, 1-2 mm. wide, densely white-tomentose beneath; inflorescence 

 2-5 cm. long, floccose, with ascending or spreading branches; involucres of the 

 lower forks short-peduncled, 2.5 mm. long, turbinate, slightly floccose; lobes 

 ovate; perianth turbinate, 2 mm. long; outer lobes obovate, rounded or emargin- 

 ate, the inner somewhat narrower. E. effusum foliosum Torr. (?) E. effusum 

 leptophyllum Torr. Dry plains: Tex. Colo. Utah Ariz. Son. Jl-Au. 



84. E. Mearnsii Parry. Depressed undershrub, with lanate twigs; leaves 

 crowded, more or less fascicled, linear, 5-10 mm. long, revolute, tomentose beneath, 

 glabrous above, acute; inflorescence of few involucres, about 1 cm. long; invo- 

 lucres short-peduncled, 3 mm. high, slightly tomentose or glabrate; lobes rounded; 

 perianth turbinate, 2.5-3 mm. high; lobes obovate or spatulate, the outer broader. 

 Rocks: Ariz. Utah. Son. O. 



