980 CARDUACEAE 



lent sessile the lower sheathing at the base; heads paniculate-cymose; involucres 

 hemispheric, 8-10 mm. high, densely puberulent; bracts linear attenuate. A. 

 polycephala A. Nels. Meadows: Mont. Colo. Calif. Wash. Submont. 

 Mont. Jl-Au. 



17. A. caudata Rydb. Stem 2-3 dm. high, leafy, villous, and densely 

 glandula'r-puberulent; leaves linear-lanceolate, mostly sheathing at the base, 

 densely glandular-puberulent and with scattered villous hairs, 5-10 cm. long, 

 with entire, somewhat revolute margins; heads mostly 3, cymose; involucres tur- 

 binate, about 1 cm. high; bracts linear-lanceolate, almost subulate, attenuate; 

 ligules' nearly 1 cm. long. Wet places: Utah. Mont. Au. 



18. A. macilenta Greene. Stem 4-7 dm. high, softly villous; leaves 5-6 

 pairs, the lower ones elliptic-oblanceolate, tapering below into winged petioles, 

 often connate-sheathing, sparingly and softly short-pubescent on both sides, 

 repand-denticulate or entire; upper leaves lanceolate, sessile; heads 1-3; involucres 

 hemispheric, about 12 mm. high; achenes sparingly hirsutulous; pappus tawny, 

 barbellate. Mountains: Colo. Utah Wyo. (? Alta.). Mont. Subalp. Jl- 

 Au. 



19. A. arcana A. Nels. Stem about 3 dm. high, glandular-granuliferous; 

 basal leaves petioled; blades oblong-oblanceolate, glandular-granuliferous, den- 

 ticulate; upper leaves lanceolate, sessile, 3-5 cm. long; heads usually 3; involucres 

 turbinate, about 8 mm. high; rays orange; achenes sparingly hispidulous; pappus 

 whitish, barbellate. Rock crevices in the mountains: Wyo. Utah Ida. Mont. 

 Jl-Au. 



20. A. coloradensis Rydb. Stem about 2 dm. high and with about 3 pairs 

 of leaves, villous; lower leaves obovate, nearly sessile, sparingly pubescent, 4-5 

 cm. long; upper leaves sessile, ovate or ovate-lanceolate, 5-nerved; heads often 

 solitary or few; involucre hemispheric; bracts broadly oblanceolate, acute or 

 acuminate, often tinged with purple, 8-9 mm. long; ligules bright yellow, over 

 1 cm. long; achenes finely strigose. Mountains: Colo. Mont. 



21. A. ovata Greene. Stem 3-4 dm. high, glandular-puberulent and slightly 

 villous; lower leaves obovate, with short winged petioles, finely pubescent on 

 both sides, callous-denticulate or entire; upper stem-leaves ovate, sessile; heads 

 1-5; involucres hemispheric, 10-15 mm. high; bracts lanceolate, acuminate; 

 achenes hirsute, angled. Mountains: Utah Wyo. Mont. Subalp. Jl. 



22. A. znollis Hook. Stem 3-6 dm. high, glandular-puberulent and more 

 or less villous; lower leaves oblanceolate, short-petioled, 5-15 cm. long, usually 

 denticulate, more or less pubescent on both sides; upper leaves sessile, ovate to 

 lanceolate; heads 1-3; involucres hemispheric, 12-15 mm. high; achenes hirsute. 

 A. crocea and A. crocina Greene. Mountains: Alta. Colo. Utah Wash. 

 B.C. Submont. Mont. Je-Au. 



23. A. amplexifolia Rydb. Stem 3-6 dm. high, sparingly ciliate; stem- 

 leaves ovate-lanceolate, sharply and saliently dentate, 5-12 cm. long, broad, 

 rounded and sometimes half-clasping at the base; heads 3-9; involucres hemi- 

 spheric, about 12 mm. high; bracts linear-lanceolate, acute or acuminate; achenes 

 hirsutulous. A. ampkxicaulis Nutt. (?) A. columbiana Greene. A. Greenei A. 

 Nels. Mountains in damp places: B.C. w Mont. Wash. Submont. Je-Jl. 



24. A. Macounii Greene. Stem 6-10 dm. high, glabrous or sparingly 

 ciliate; lower stem-leaves oblanceolate, tapering below, 5-15 cm. long, saliently 

 dentate, hispidulous-ciliolate on the margins, sparingly pubescent above; upper 

 stem-leaves elongate-lanceolate, long-attenuate, somewhat clasping; heads 1-7; 

 involucres hemispheric, 10-12 mm. high; bracts linear-lanceolate, acuminate; 

 achenes hirsutulous. VaUeys: B.C. Alta. Mont. Wash. Submont. 



25. A. rivularis Greene. Stem 3-6 dm. high, more or less glandular-granu- 

 lilerous and sparingly hirsute; leaves 3-5 pairs, the lowest short-petioled and 



lanceolate, the rest sessjle, lanceolate, denticulate; heads 3-5; involucres 

 T^o P :5 eriC ' a J? OUt 12 mm> high > bracts linear-lanceolate, acuminate; ligules 



^12, deep yellow, 12-15 mm. long; achenes sparingly hirtellous and granulifer- 

 ous. Along mountain streams: Alta. Ore. B C Je-Au 



