THISTLE FAMILY 989 



11. S. blitoides Greene. Stem 2-3 dm. high, leafy; leaves thinner than in 

 the preceding, obovate or oval, tapering at the base, sharply dentate, 2-4 cm. 

 long; inflorescence leafy-corymbose, but the peduncles 3-10 cm. long; bracts as 

 in the preceding species; ligules 7-8 mm. long. Mountains: Colo. Utah s 

 Wyo. Subalp. Alp. Au. 



12. S. Fremontii T. & G. Glabrous and fleshy perennial, branching below 

 the surface of the ground; stem about 1 dm. high; leaves 2-3 cm. long, rounded- 

 obovate or spatulate, fleshy, coarsely toothed or lobed, the lower with a winged 

 petiole, the upper sessile; involucres campanulate, about 8 mm. high and broad; 

 bracts linear or linear-lanceolate, acute, glabrous, the calyculate ones very small; 

 ligules bright yellow, about 8 mm. long. S. ductoris Piper. S. occidentalis 

 rotundatus Rydb. Alpine regions, among loose rocks: Mont. Wyo. Ore. B.C. 

 Subalp. Alp. Jl-Au. 



13; S. invenustus Greene. Stem 1-1.5 dm. high, very leafy, glabrous; 

 leaves 2^ cm. long, spatulate or obovate, doubly laciniate-toothed, glabrate or 

 nearly so, scaberulous on the margins; heads 2-5, short-peduncled; involucres 

 campanulate, about 1 cm. high and 8 mm. broad, glabrous; bracts linear, scarious- 

 margined, the calyculate ones few and half as long; ligules orange, 6-7 mm. long; 

 achenes glabrous, striate. Higher peaks: Colo. e Utah. Mont. Alp. Jl-Au. 



14. S. variifolius Rydb. Stem 6-12 dm. high, angled or striate, branched 

 above, leafy; basal leaves petioled; blades cordate, sahently dentate, acute, 

 rather firm, about 1 dm. long; upper stem-leaves elliptical or lanceolate, short- 

 petioled or sessile, 5-10 cm. long; cyme open; heads few; involucres 6-7 mm. 

 broad; bracts linear, acute, with broad membranous margins, slightly shorter 

 than the disk, the calyculate ones small, linear-subulate ; ligules 5-10 mm. long; 

 achenes glabrous, angled. Wet places in the mountain regions: Mont. Ida. 

 Submont. Jl-Au. 



15. S. saliens Rydb. Stem simple, 3-4 dm. high; leaves rather thick, peti- 

 oled or the upper subsessile; blades 3-5 cm. long, elongate-triangular or lanceo- 

 late, very sharply dentate; cyme corymbiform. dense; involucre 8 mm. high and 

 broad; bracts broadly linear, acute, rather thick; ligules bright yellow, 8-10 mm. 

 long; achenes glabrous. Wet subalpine stations, among rocks: Yukon Mont. 

 Wyo. Wash. B.C. Mont. Subalp. Jl-Au. 



16. S. triangularis Hook. Stems several from the same clump, 5-15 dm. 

 high; leaf -blades thin and shining, elongate-triangular or lanceolate, acute, 5-20 

 cm. long, dentate, with triangular teeth; petiole narrowly winged, in the lower 

 1-3 cm. long: heads numerous in an open, more or less leafy cyme; involucres 

 campanulate, 6-8 mm. high and broad; bracts broadly linear, very thin, the 

 calyculate ones linear-subulate, short; ligules light yellow, about 1 cm. long; 

 achenes glabrous. Along brooks and in swamps, especially in the mountains: 

 Sask. N.M. Calif. Alaska. Submont. Subalp. Je-Au. 



17. S. admirabilis Greene. Stem simple or branched above, striate, 5-15 

 dm. high; leaves linear-lanceolate, 10-15 cm. long, sharply serrate with callous 

 teeth, acute or acuminate at both ends, sessile or very short-petioled; cyme 

 paniculate, with numerous heads and somewhat leafy; bracts lanceolate or ovate- 

 lanceolate, two-thirds as long as the disk, thick on the back,. with broad scarious 

 erose margins; tips abruptly spreading; ligules light yellow, about 1 cm. long; 

 achenes glabrous and shining, striate. Damp places in mountain valleys: Colo. 



-Wyo. Submont. Mont. Jl-Au. 



18. S. Solidago Rydb. Stem about 1 m. high, glabrous, very leafy and 

 much branched; leaves 6-10 cm. long, rather thin, coarsely dentate, with salient 

 teeth, short-petioled or the upper subsessile; panicle very large and branched, 

 elongate; heads small, about 8 mm. high; involucres glabrous; bracts linear, 

 yellowish, much shorter than the disk; ligules pale yellow; achenes glabrous. 

 Wet places: Mont. Ida. 



19. S. serra Hook. Stem 6-15 dm. high; leaves lanceolate or linear-lanceo- 

 late, 5-15 cm. long, sharply serrate or the upper entire, subsessile or the lower 

 short-petioled; heads very numerous, in a leafy panicle; involucre almost cylin- 



