77 



THISTLE FAMILY 997 



Stem 1-3 dm. high, branched near the base; lower 

 alades ovate to obovate, 1-4 cm. long, rounded at 

 e; stem-leaves lyrate or irregularly pinnatifid, the 



tomentose at the base; bracts often reddish tipped; ligulcs yellow; achenes gla- 

 brous. Mountains: Alta. — ^Wash. Mont. Je-JI. 



78. S. nephrophyllus Rydb. Stem 3-5 dm. high, branched above, gla- 

 brous; basal leaves long-petioled ; blades of the earliest reniform or orbicular, 

 oi,-„T,+i,, T-TOTr^r rx,. oTi+iVo fVinad nf t.hfi succRfidine ones oval, sinuate: lower stem- 



segmonts 



wavy 



leaves petiole ., -- ., lirrn uu 



and rounded sinuses; heads rayless; mvolucres campanulate, 7-9 mm. high, 



bracts linear, glabrous, 5-6 mm. long, greenish yellow or browTush; achenes gla- 

 brous. (?) S. debilis Nutt. Wet ground: Mont.— Colo.— Ida. Jl-Au. 



79. S. idahoensis Rydb. Stenj 4-5 dm. high, branched, striate, tinged 

 with purplish; basal leaves obovate, serrate; lower stem-leaves oblanceolate m 

 outUne, about 1 dm. long, petioled, the upper ovate or lanceolate in outline, ses- 

 sile and auricled at the base, all bluish green, pmnately divided into oblong or 

 oblique-cuneate incised segments; heads numerous, about 1 cm high; bracts 

 veiy narrowly linear, equalling the disk; achenes glabrous. Wet places. Mont.— 

 Ida.— B.C. Plain— Suhmont. Je-Jl. 



80 S. pauciflorus Pursh. Stem glabrous, 3-5 dm. high, slender; basal 

 leaves petioled; blades oval, ovate, or subcordate, crenate or rarely serrate, 1-3 

 cm long- stem-leaves lyrate or pinnatifid, the upper reduced; heads about 8 mm. 

 hSh • ^voSe campanulate ; bracts narrowly . Unear, acute, usually purple- 

 tinted ;^Ihenes glabroL. ^^•^'^ffT^^^^-^^tLwrc ^"^•^"" 



—Mich.— Wvo.— Calif.— B.C.— Alaska. Mont.—Subalp. J^Au. 



81 S fedifolius Rydb. Stem slender, ^eak about 1.5 dm. high; basal 

 leaves 3-5 cm long with slender petioles; blades 1-2 cm. long, rounded-ovate or 

 Wdlv ova? waw or subentirel stem-leaves mostly small, pinnately divided 

 info short oblonglegnients; heads 2-3, about 6 mm. high; involucres somewhat 

 tobifate: bSs bfoadly' lanceolate, conspicuously membr anous-margmed ; 

 achenes glabrous. High mountams: Colo. Svbalp. 



R9 S subnudus DC. Stem 1-3 dm. high; basal leaves petioled; blades 



acSesTbrTu. Senecio aureus suim'^us A Gray. Marshy ground . Mont.- 

 Wyo.—n Calif .-B.C. Mont.Subalp. Jl-Au. . 



M S Wardii Greene. Stem 5-15 cm. high, glabrous ; basal leaves petioled, 



blades tLpob^S l-i^cite^ heTdtsS ^VS^^^^^^ 

 leaves much reduced, sessile, crenate, heads so, e^^^^^^ Unear-lanceolate; ligules 



involucres campanulate, 7-8 mm. high, Dracts S > tj, . -Mont. Mont. 



tew, 1-0 . B, j^ ^ leaves numerous, 



what tomentose when Y «^^g 5 J^* Jf I^^Yr Jt-lU^^^^ 



alp.— Alp. Je-Au. 



85 S. Porteri Greene. Stem scapuonn 

 ,ni;^- blades subreniform, crenate or crei 



green above, glabrous; heads solitary, y-x-" in^er slightly scarious-margined ; 

 not Schultz-Bip. Alpine peaks: Colo. Alp. 



