910 CARDUACEAE 



high, 5-10 mm. broad; ligules purplish, 4-5 mm. long. Mountains: Ida. — Mont. 

 — Nev. — Utah. Submont. — Mont. Au-S. 



89. E. arenarioides A. Gray. Stem 1-2 dm. high, glabrous, filiform; 

 basal leaves narrowly linear-oblanceolate to almost filiform, 2-4 mm. long, gla- 

 brous; stem-leaves linear-filiform, diminishing upwards; heads usually solitary; 

 involucres 4-5 mm. high and nearly 1 cm. wide; bracts linear-subulate, acumi- 

 nate, glandular-puberulent, slightly purplish; rays bluish purple or white, 5 mm. 

 long; achenes flattened, hirsute; pappus simple. Aster arenarioides A. Gray. 

 Mountains: Utah. Mont. Jl-Au. 



90. E. laetevirens Rydb. Stems several, 1.5-2 dm. high, slender, erect or 

 ascending, silky-strigose; basal leaves verj' narrowly linear-oblanceolate, acute, 

 5-10 cm. long, sparingly strigose; stem-leaves narrowly linear; heads solitary; 

 involucre 6 mm. high, 12-15 mm. broad, grayish villous-hirsute ; ligules numerous, 

 blue or pm-ple, 7-8 mm. long. Mountain slopes: Wyo. Submont. — Mont. Jl- 

 Au. 



91. E. montanensis Rydb. Stem 1-2 dm. high, softly strigose; basal 

 leaves narrowly linear to linear-oblanceolate, sparingly strigose, 5-10 cm. long; 

 stem-leaves narrowly linear; heads solitary; involucres about 7 mm. high and 

 12-15 mm. broad; bracts linear, acuminate, densely hirsute-villous ; ligules white 

 or pinkish, 5-7 mm. long, 1.5-2 mm. wide. E. Tweedyanus Canby & Rose. 

 Wyomingia Tweedyana A. Nels. Dry hills and plains: Mont. — Wyo. Plai7i — 

 Mont. My-Au. 



92. E. Scribneri Canby. Stem 3-8 cm. high, grayish-strigose; basal leaves 

 linear or narrowly linear-oblanceolate, strigose, 3-5 cm. long; heads solitary; 

 involucres 5-6 mm. high, about 15 mm. wide; ligules 7-8 mm. long. E. Macounii 

 Greene. Mountains: Alta. — Wyo. Mont. — Subalp. Jl-Au. 



93. E. Parryi Canby & Rose. Stem scapiform, 3-5 cm. high, densely hir- 

 sutulous; leaves narrowly linear, 2-4 cm. long, densely hirsutulous; involucres 

 densely hirsute, 5-6 mm. high, 10-12 mm. broad; ligules 6-7 mm. long. Dry 

 hills: Mont. Mont. Jl. 



94. E. utahensis A. Gray. Perennial, with a branched woody caudex, 

 often suff rutescent ; stem 3-4 dm. high, silvery-strigose, branched; leaves all 

 narrowly linear, 5-10 cm. long, silvery strigose-canescent; heads solitary, on long 

 peduncles; involucres 6-8 mm. high, 10-12 mm. broad; bracts lance-linear, 

 acuminate, silky-strigose; ligules white, 12-15 mm. long. E. tetrapleurus (A. 

 Gray) Heller. Arid regions: s Utah — Ariz. My-Je. 



95. E. sparsifolius Eastw. Suffruticose perennial; stem 3-4 dm. high, 

 silvery strigose; lower leaves narrowly oblanceolate, 3-5 cm. long, 4r-5 mm. wide, 

 silvery-strigose, the upper narrowly linear or nearly so, the uppermost almost 

 filiform and reduced; involucre hemispheric, 6-8 mm. broad; bracts linear, silvery- 

 strigose; achenes quadrangular, strigose-hirsute. Wyomingia vivax A. Nels. 

 Canons: se Utah — Ariz. Son. Je-Au. 



96. E. filifolius (Hook.) Nutt. Perennial, with a branched woody caudex, 

 often more or less suffruticose; stem 2-6 dm. high, cinereous-strigose; leaves 

 linear-filiform or filiform, cinereous, 2-5 cm. long; involucres about 5 mm. high 

 and 10 mm. broad; ligules about 8 mm. long, bluish, violet, or white. E. linearis 

 Piper, in j)art. Rocky groimd : Mont. — -Ida. — Calif. — B.C. Son. Je-Au. 



97. E. linearis (Hook.) Piper. Perennial, with a branched caudex; stem 

 1-3 dm. high, decumbent at the base, slender, cinereous-strigose; leaves all fili- 

 form, cinereous, 3-5 cm. long; involucres 5 mm. high, 10 mm. broad; ligules 7-8 

 mm. long, white or bluish. Dry or sandy places : Wash. — Ida. — Ore. Son. My- 

 Jl. 



98. E. luteus A. Nels. Perennial, with a ccspitose, multicipital caudex; 

 stem 1 dm. high or less, cinereous-strigose; leaves narrowly linear, cinereous- 

 strigose, 3-5 cm. long; heads solitary; involucres about 5 mm. high and 1 cm. 

 broad; ligules 30-40, yellow, 3-4 mm. long. Sandy hillsides and stream banks: 

 Wyo. Plain. Jl. 



