THISTLE FAMILY 903 



late; ligules 4 mm. long, pale rose or white. Stony hills: Wash. Mont. Sub- 

 mont. Jl-Au. 



20. E. flabellifolius Rydb. Stem 1-2 dm. high, glandular-puberulent 

 above; basal leaves petioled, about 3 cm. long, slightly glandular-puberulent; 

 stem-leaves cuneate or obovate, less divided; heads about 10 mm. high and 10-15 

 mm. in diameter; bracts linear, acuminate, glandular-puberulent; ligules 7-8 

 mm. long, light pink or white. Rocky slides: Wyo. Alp. Au. 



21. E. leiomerus A. Gray. Stem 5-15 cm. high, often decumbent at the 

 base; basal leaves spatulate, obtuse, 3-8 cm. long, glabrous or nearly so; stem- 

 leaves few and small, linear or oblong; heads solitary; involucres 5-6 mm. high, 

 10-15 mm. broad; bracts linear, acute, purplish; ligules about 40, violet, 6-8 mm. 

 long. E. minusculus Greene. E. Garrettii A. Nels. Alpine peaks: Wyo. N.M. 

 Utah Alta. Submont. Alp. Jl-Au. 



22. E. spathulifolius Rydb. Stem 5-8 cm. high, glabrous or slightly 

 puberulent above; basal leaves 2-3 cm. long, glabrous, broadly spatulate; stem- 

 leaves linear-oblong, obtuse; involucres about 1 cm. broad; bracts linear-lanceo- 

 late, acute, slightly glandular-puberulent; ligules light blue, in age white, about 

 8 mm. long. High mountains: Wyo. Alp. Jl-Au. 



23. E. controversus Greene. Stem 5-15 cm. long, scapiform, strigose, 

 especially above, monocephalous; basal leaves oblanceolate or oblong-spatulate, 

 3-^6 cm. long, minutely puberulent or glabrate except the margins; stem-leaves 

 few, linear, near the base; bracts linear, acute, glandular-puberulent, as well as 

 sparingly strigose, purplish; ligules pale purple or white, 5-8 mm. long. Moun- 

 tains: Utah. Submont. Subalp. Je-Au. 



24. E. glandulosus Porter. Stem 5-15 cm. high, glandular-scabrous; basal 

 leaves numerous, 3-8 cm. long, oblanceolate or linear-oblanceolate, glandular- 

 scabrous; stem-leaves small and linear; heads solitary; involucres 6^-8 mm. high/ 

 10-15 mm. broad; bracts linear, acute, glandular-puberulent and hirsute; ligules 

 purple or blue, 8-10 mm. long. Hills and mountains: Wyo. Colo. Submont. 

 Alp. 



25. E. gracilis Rydb. Stem ascending, strigose, about 15 cm. high, mono- 

 cephalous; basal leaves oblanceolate or linear-oblanceolate, 2-5 cm. long; stem- 

 leaves narrowly linear, acuminate; involucres about 6 mm. high, 10-12 mm. 

 broad; bracts narrowly linear, tinged with purple, strigose; ligules about 50, 

 light purple, 7-10 mm. long. Meadows and hillsides: Wyo. Submont. Jl-Au. 



26. E. Engelmannii A. Nels. Stem decumbent at the base, 3-20 cm. 

 long; basal leaves numerous, linear or linear-oblanceolate, grayish-strigose, 3-10 

 cm. long; stem-leaves smaller; heads usually solitary; involucres about 5 mm. 

 high and 1 cm. broad; ligules white or rarely lilac, about 40, 5-7 mm. long. E. 

 simulans Greene. Stony slopes: Mont. Colo. Utah Ida. Submont. Je-Jl. 



27. E. ursinus D. C. Eat. Stem 1-2 dm. high, ascending, sparingly hairy or 

 glabrous; basal leaves numerous, oblanceolate or linear-oblanceolate, 3-8 cm. 

 long; stem-leaves linear or linear-lanceolate, acute; involucres 5-7 mm. high, 

 10-15 mm. wide; bracts hirsute and glandular-puberulent, linear, acute; ligules 

 purple or violet, 8-10 mm. long. Mountains: Mont. Colo. Utah Ida. Sub- 

 mont. Subalp. Jl-Au. 



28. E. Evermannii Rydb. Scapose perennial with a cespitose rootstock; 

 leaves basal, narrowly spatulate, 2-4 cm. long, glabrous, obtuse; stem-leaves if 

 present less than 5 mm. long; stem scapiform, 3-5 cm. long, slightly strigose 

 above, otherwise glabrous; involucres hemispheric, about 1 cm. broad; bracts 

 linear, abruptly acute, purple-tinged, sparingly hirsute-villous; ligules about 20, 

 apparently white, 8 mm. long. Mountain tops: Ida. Alp. Au. 



29. E. Peasei Rydb. Stem 5-8 cm. high, with 1-4 leaves; basal leaves about 

 2 cm. long, petioled, oblanceolate, acute, strigose; stem-leaves linear, sessile; 

 heads solitary; involucre 4-5 mm. high, about 1 cm. wide; bracts linear-subulate, 

 sparingly hirsute; ligules numerous, about 7 mm. long, pinkish. Mountains: 

 Colo. e Utah. Je. 



30. E. radicatus Hook. Stem 3-6 cm. high, scapiform, hirsute-strigose ; 

 basal leaves oblanceolate to nearly linear, 1-4 cm. long, sparingly hirsute or gla- 



