996 CARDUACEAE 



long or often lacking; achenes glabrous, striate. S. flavovirens Rydb. Wet 

 meadows: Mont. N.M. Ida. Submont. Je-Jl. 



69. S. multnomensis Greenm. Stem 3-7 dm. high, slightly floccose in 

 the axils of the leaves; lower leaves 4-15 cm. long, petioled; blades oblong-ob- 

 lanceolate, obtuse or rounded at the apex, crenate-dentate, or somewhat lyrately 

 lobed; upper stem-leaves pinnatisect, or the uppermost entire; heads 10-13 mm. 

 high; involucres campanulate; bracts linear-lanceolate, pale green; ligules yellow; 

 achenes glabrous. Meadows and open places : Sask. Ore. B.C. Mack. Sub- 

 mont. Mont. Je-Jl. 



70. S. Willing!! Greenm. Stem erect, 2.5-3 dm. high, glabrous; leaves 

 oblong-lanceolate, 3-12 cm. long, crenate-serrate to pinnatifid into oblong entire 

 or subentire lobes, floccose-tomentulose along the veins when young; heads 8-10 

 mm. high; involucre campanulate, sparingly floccose; bracts linear-lanceolate; 

 ligules yellow; achenes glabrous. Gravelly soil: Man. Alta. Plain. 



71. S. Tweedy! Rydb. Stem glabrous, or slightly floccose at the leaf-axils, 

 4r-Q dm. high, striate; basal leaves 3-15 cm. long, petioled; blades elliptic or oval 

 to oblanceolate, crenate-dentate, often lyrate-pinnatifid, with a few lobes below 

 the large terminal one; lower stem-leaves similar, but more pinnatifid; upper 

 stem-leaves deeply pinnatifid, with oblong toothed divisions ; involucres somewhat 

 turbinate at the base, about 8 mm. high and as broad; ligules narrow, bright 

 yellow, 8-10 mm. long; achenes hispidulous on the margins. S. flavovirens 

 Greenm., mainly, not Rydb. Wet meadows: Wyo. Mont. Je-Au. 



72. S. dimorphophyllus Greene. Stem 1.5-3 dm. high; basal leaves 2-3 

 cm. long, obovate or spatulate, crenate or subentire, with a winged petiole; lower 

 stem-leaves with broader winged petioles somewhat auricled at the base, or else 

 oblong without distinction between blade and petiole; upper stem-leaves ovate 

 or triangular with very large and large-toothed auricles; heads 8-10 mm. high; 

 bracts about 20, linear; ligules 7-8 mm. long and 1.5-2 mm. wide, bright to pale 

 yellow; achenes striate, glabrous. Senecio aureus croceus A. Gray, and S. crocatus 

 Rydb., in part. S.heterodoxus Greene. Higher mountains: Wyo. Colo. Mont. 



Alp. Jl-Au. 



73. S. crocatus Rydb. Stem 3-7 dm. high, glabrous, leafy; basal leaves 

 long-petioled ; blades thin, glabrous, broadly ovate, subcordate, or even subreni- 

 form, sinuate or subentire, 4-8 cm. long; stem-leaves larger, lyrate pinnatifid or 

 lobed, the lower 1-1.5 dm. long, with winged petioles and enlarged, laciniate 

 bases, the uppermost sessile, with enlarged, clasping, and lobed bases; heads 8-9 

 mm. high; involucres hemispheric, glabrous; bracts linear, acute; ligules orange 

 or brick-red, about 7 mm. long; achenes glabrous. S. aureus croceus A. Gray. 

 5. pyrrochrous Greene. Wet meadows: Colo. Wyo. Mont. Jl-Au. 



74. S. Tracy! Rydb. Stem about 4 dm. high, glabrous; basal leaves gla- 

 brous, long-petioled; blades round-oval or oval, thin, 1.5-5 cm. long, 1-3 cm. 

 wide, entire or merely wavy, rounded at the apex, rounded, truncate or subcordate 

 at the base; stem-leaves lanceolate, acuminate, 2-6 cm. long, the uppermost still 

 smaller, sinuate-crenate, auriculate-clasping; involucres broadly turbinate, 6-7 

 mm. high; bracts linear, abruptly acute, glabrous; ligules yellow, 6-8 mm. long, 

 about 2 mm. wide; achenes glabrous. Mountains: Colo. e Utah. Mont. 

 Subalp. Jl-S. 



75. S. Pammelii Greenm. Stem 2-4 dm. high, more or less purplish to- 

 wards the base, slightly white-tomentose in the axils; lower leaves long-petioled, 

 1-2.5 cm. long; blades rounded-ovate or suborbicular, subcordate or truncate at 

 the base, sinuate-crenate or entire; stem-leaves lyrate to entire; heads 7-10 mm. 

 high; bracts linear-lanceolate, acute, glabrous; ligules bright yellow; achenes gla- 

 brous. Mountains: Utah Nev. Mont. Jl-Au. 



76. S. aquariensis Greenm. Stem erect, 2-3.5 dm. high; lower leaves peti- 

 oled; blades ovate to oblong-lanceolate, 1-7 cm. long; stem-leaves petioled and 

 lyrate to sessile and pinnatisect; heads 8-10 mm. high; involucre campanulate; 

 bracts lanceolate; achenes glabrous. Table-lands: Utah. Mont. Au. 



