BUCKWHEAT FAMILY 217 



and finely white-tomentose beneath, spatulate or oblanceolate; perianth deep 

 yellow, sometimes tinged with red, appressed-silky ; filaments villous below the 

 middle; achenes sparingly villous at the tip, 2 mm. long. Mountains: Alta 

 Mont. Ore. Mont.Subalp. Jl-Au. 



10. E. xanthum Small. Stems scapiform, 3-5 cm. high, tomentose; leaves 

 numerous, basal, 2-3 cm. long; blades spatulate, obtuse, somewhat floccose, but 

 greenish above, densely villous-tomentose beneath; perianth yellow, becoming 

 8 mm. long, silky-pubescent throughout; achenes about 5.5 mm. long, pubescent 

 at the apex. E. flavum A. Nels., in part. Mountain tops: Colo. Wyo. Alp. 

 Au. 



11. E. androsaceum Benth. Stems scapiform, 2-10 cm. high, white- 

 tomentose; leaves basal, short-petioled, 1-2 cm. long; blades spatulate or ob- 

 lanceolate, loosely tomentose, but soon glabrate above, densely white-tomentose 

 beneath; perianth light yellow, turbinate, barely stipitate, 4-5 mm. long; achenes 

 glabrous. Hills and mountains: Alta. Mont. B.C. Submont. Mont. Je- 

 Au. 



12. E. thymoides Benth. Stems 1-2 dm. high; leaves 4-8 mm. long, linear, 

 white-tomentose beneath, cinereous above; peduncles 3-6 cm. long, slender, 

 with a whorl of leaves below the middle; involucre solitary, turbinate, villous, 

 about 5 mm. long; perianth 3-4 mm. long, villous, pale yellow, turning purplish; 

 lobes obovate; ovary pubescent. Rocky places: Wash. Ida. Son. My-Jl. 



13. E. caespitosum Nutt. Stems scapiform, 3-6 cm. high, tomentulose or 

 in age glabrate; leaves basal, oval or elliptic, short-petioled, 5-10 cm. long, white- 

 tomentose on both sides, more or less revolute on the margins; involucre tur- 

 binate, tomentose; tube about 3 mm. long; lobes elliptic or linear; perianth 

 yellow, turning purplish brown in age, villous below; achenes hirsute at the apex. 

 Hills: Mont. Wyo. Colo. Nev. Ida. Mont.Subalp. My-Je. 



14. E. andinum Nutt. Stems scapiform, 2-4 cm. high, floccose; leaves 

 numerous, basal, oblanceolate or spatulate, 1 cm. long or less, loosely villous- 

 floccose on both sides; involucre turbinate, tomentose; tube 2-2.5 mm. long; 

 perianth turbinate, bright yellow. Dry hills: Mont. Wyo. Ida. Nev. 

 Mont. Je-Jl. 



15. E. sphaerocephalum Dougl. Stem with decumbent cespitose branches, 

 rising 1-2 dm. above ground; leaves and bracts verticillate, narrowly oblance- 

 olate, 1-3 cm. long, white-tomentose beneath, with more or less revolute margins, 

 floccose or glabrate above; involucres solitary or 2 or 3, turbinate, the lateral 

 ones sometimes bracted; tube about 3 mm. long; lobes oblong, fully as long; 

 perianth-lobes oblanceolate. (?) E. cupreum Gand. Rocky hills: n Calif. 

 Ida. Wash. Son. Je-Jl. 



16. E. fasciculifolium A. Nels. Leaves fasciculate or verticillate on the 

 enlarged nodes, 1-3 cm. long, petioled, pale green and glabrate above, obscurely 

 tomentose beneath; involucres in few-rayed umbels, campanulate; lobes ovate- 

 oblong, reflexed, as long as the tube, sparsely silky-villous; perianth slightly 

 silky- villous; lobes broadly obovate. Dry mountain sides : Ida. Submont. Au. 



17. E. pyrolaefolium Hook. Leaves clustered at the base, petioled; 

 petioles long-villous; leaf-blades oval or broadly spatulate, sparingly villous or 

 glabrous, coriaceous; scape 1 dm. long or less; umbels few-rayed; bracts mostly 

 2 or 3; involucres campanulate, villous, sinuately toothed; perianth white or 

 pinkish, 4-5 mm. long, long-villous. Mountains: Wash. Ida. Calif. Mont. 

 Alp. Au-S. 



18. E. compositum Dougl. Floral stems scapiform, 2-4 dm. high; leaves 

 basal, 5-15 cm. long, petioled; blades 3-8 cm. long, 3-4 cm. wide, loosely floccose 

 above, densely white-tomentose beneath; inflorescence compound-umbellate; 

 bracts linear or lanceolate; involucres broadly campanulate, villous or glabrous 

 (var. leianthum Benth.), 4 mm. high; perianth ochroleucous, 3-4 mm. long, 

 campanulate; achenes hairy above. Rocky soil and dry plains: Wash. Ida. 

 Calif. Son. Submont. Ap-Au. 



