BUCKWHEAT FAMILY 219 



29. E. Tetraneuris Small. Flowering stems scapiform, 1-1.5 dm. high; 

 leaves basal, petioled, elliptic or oblong, 1-3 cm. long, acute, silky-strigose above, 

 white-tomentose beneath, somewhat revolute-margined; involucres campanulate, 

 3.5 mm. long, silky; perianth lemon-yellow, about 6 mm. long, silky without; 

 lobes oblong, the inner broader than the outer; ovary densely pubescent. Dry 

 mesas: Colo. Plain Submont. My. 



30. E. longilobum M. E. Jones. Leaves tufted, petioled, densely villous- 

 tomentose; blades oblanceolate or spatulate, about 1 cm. long, slightly revolute, 

 obtuse; involucres 3-5, densely villous, campanulate; lobes about 4 mm. long, 

 erect; perianth white-woolly on the outside, sparingly villous within, yellow, 

 campanulate; lobes obovate-oblong, barely 3 mm. long; achenes very woolly. 

 Sand and dry places: Utah. Son. Submont. Je-Jl. 



31. E. Shockleyi S. Wats. Leaves spatulate, 8-10 mm. long, rarely longer, 

 densely tomentose, thick; bracts small; involucres densely white-tomentose, 

 campanulate, abc*ut 4 mm. long; perianth villous, white, with. green midveins, 

 3-4 mm. long; lobes oblong; ovary villous. Mountains: Nev. Utah. Son. 

 Submont. My-Je. 



32. E. pulvinatum Small. Leaves crowded, spatulate or oval, villous- 

 tomentose on both sides, slightly revolute, short-petioled ; involucres turbinate- 

 campanulate, 3-4 mm. high, white-tomentose; perianth oblong-campanulate, 

 2.5-3 mm. long, villous on both sides; lobes oblong, obtuse, erect, twice a-s long 

 as the tube, the inner narrower; achenes 2 mm. long, densely villous. Dry hills: 

 Utah 'Ariz. Submont. Je-Jl. 



33. E. acaule Nutt. Leaves crowded, subsessile, white-tomentose on both 

 sides, 3-6 mm. long; involucres villous, turbinate, 3 mm. long; lobes rounded, 

 obtuse; perianth yellow, campanulate, 2-2.5 mm. long, tomentose without, 

 especially below; achenes villous. Dry hills: Wyo Colo. Nev. Ida. Sub- 

 mont. Son. Je-S. 



34. E. proliferum T. & G. Scape 1.5-3 dm. high, tomentose; leaves basal, 

 petioled, white-tomentose on both sides; blades oval to nearly orbicular, 1-2 cm. 

 long; involucres campanulate, 2.5-3 mm. long, pubescent; perianth white, 

 turning purplish (a yellow-flowered form is also usually included, which may be 

 distinct), about 4 mm. long; outer lobes broadly obovate or oval, the inner 

 narrowly cuneate. River flats: Wash. Ida. Calif. Son. Je. 



35. E. orthocaulon Small. Scapes 1-3 dm. high; leaves clustered at the 

 ends of short branches, petioled; blades oval, mostly 1-1.5 cm. long, or rarely 

 smaller, densely felty-tomentose on both sides; bracts subulate; involucres 

 turbinate, floccose; lobes short, rounded; perianth ochroleucous, becoming 4.5-5 

 mm. long; outer lobes suborbicular to ovate-orbicular, the inner cuneate, about 

 as long as the outer and half as wide. Dry hills: Alta. Colo. Utah Ida. 

 Submont. Je-Au. 



36. E. ovalifolium Nutt. Scape 1-1.5 dm. high; leaves numerous, clustered, 

 petioled, white- or yellowish-tomentose, almost felty; blades usually about 1 cm. 

 long; involucres about 5 mm. long, campanulate, villous-tomentose; perianth 4 

 mm. long; outer lobes broadly oval or suborbicular, the inner cuneate, scarcely 

 half as wide. E. dichroanthum Gand. SILVER PLANT. Dry plains and hills: 

 Alta. N.M .Calif .Wash. Son.Subalp. 



37. E. depressum (Blankinship) Rydb. Scape 1 dm. high or less; leaves 

 densely clustered, petioled; blades 3-10 mm. long, densely white-tomentose; 

 involucres campanulate, about 4 mm. long; lobes triangular; perianth 2.5-3.5 

 mm. long; outer lobes oval, the inner cuneate, about half as broad, ti. ovali- 

 folium depressum Blankinship. E. rubidum frigidum Gand. Dry hills: Mont. 

 Ore. Mont. -Alp. My-Au. 



38. E. ochroleucum Small. Scape 3-4 dm. high, loosely floccose; leaves 

 densely crowded, petioled; blades 1-2 cm. long, obtuse, densely tomentose on 

 both sides; involucres 5 mm. long, campanulate, tomentose, ribbed; outer peri- 

 anth-segments elliptic, the inner spatulate-oblong, slightly longer. Dry hills: 

 Mont. Colo. Nev. Ida. Submont. My-Jl. 



