THISTLE FAMILY 929 



1-3; involucres 15-3 cm high, slightly tomentose; bracts lanceolate, the outer 

 fohaceous. exceeding the disk; hgules 2-4 cm. long, 4-8 mm. wide. Hills: B C — 

 iua. — Lalii. kiubmo?U. Ap-Je. ' * 



4. B. Careyana A. Gray. Basal leaves long-petioled; blades cordate, entire 

 somewhat grayish scabrous-puberulent, subcoriaceous, reticulate, 1-1 5 dm' 



nn!'ni"y ""'T'l ^^^^ 'V,™^ ^^gh; bracts oblong-lanceolate or a few of the out^; 



anceolate and longer all firm and puberulent; Ugules broadly oval, 15-18 mm 

 long, b-9 mm wide becoming papery and persistent; style-branches of the disk- 

 S Mv '''' ^^""^ ^^ ' ^ pubescent. Sandy plains: Ida.-Wash. 



5. B. incana Nutt Leaves all basal, 1-1.5 dm. long, short-petioled, tomen- 

 tose, pinnately divided mto ovate, entire or shghtly toothed divisions i-3 cm 

 long scape 1-2 dm. high; involucre fioccose, 15-20 mm. high, 20-25 mm broad- 

 bracts lanceolate, appressed or the outer with spreading tips; hgules 2-"^ 5 cm' 



6. B. floccosa Rydb. Leaves mostly basal, fioccose on both sides 2-3 dm 

 co^fJv^S Pi^"=^tely divided to near the midrib or some sometimes only 

 coarsely toothed; segments lanceolate, acute, 3-5 cm. long, coarsely toothed 



luc^e "SiTo' \^ ^^- u^\ ^^^""^' *^^ "PP«^ P°^ti°^ d^^^^ly fioccose; nvi 

 lucre about 3 cm. broad; bracts numerous m several series, lanceolate, the outer 



^^Z'^^''f'''^^''^^ recurved tips; Ugules 3-^ cm. long, about 1 cm. T^de HiU- 

 sides: Alont.— W yo.— Ida. Plain—Mont. My-Jl. 



Ki J" ^' *erebinthacea (Hook.) Nutt. Leaves mostly aU basal, short-petioled- 

 blades 1-2 dm. long lanceolate in outline, some of them only 'incised-^oothe ' 

 others pmnately divided, hirsutulous-pubescent or glabrate; scape 1-3 dm high 

 mvolucre 1.3-20 mrn. high; bracts lanceolate, ahnost equal iS stony g;o3s 

 and open woods: Ida.— Wash.— Ore. Suhmont. My-Je. grounas 



8. B. macrophylla xNutt. Stem 4-6 dm. high, sparingly villous-hirsute- 

 basal leaves 2-o dm. long, petioled, most of them pin^iately divided into anceo- 

 late divisions, but some occasionally only toothed; mvolucre 25 mm higl and 

 2.5-4 cm. broad; bracts hnear-lanceolate, loose and the outer reflexed- Hgules 3-5 

 cm. long, about 1 cm. wide. On dry hillsides: Utah-Wyo. iSn^ My-Je 



9. B. hirsuta Nutt. Stem scapiform, sparingly villous-hii-sute - leaves 

 short-petioled, lanceo ate in outUne, piiinatelWividedVdivisions S or lanceo 

 late coarsely oothed or again pmnatifid, strongly veined and rigid; involucre 

 fc i'- T^- ^''^^ r^^ ^To ^^■°^^' ^i^'*' Unear-lanceolate, spreallin'g, hirsute 

 STJ MWe'. ^"^' °''^- ^"^ ^'^' ^''°^^-" Utah-B.C.-CaS: 



72. WYETHIA Nutt. IMule-ears. 



Involucral bracts nearly equal, in 2-3 series; stem not white 



Kajspale yellow or wJiite; plant hispid. "^ "uiti,. t.^ ^ ,- ,. .^ 



Rays bright vellow. ^^piu. j ^y helianthoides. 



Plant glafjroiLs. „ „. 



Plant pubescent. ^- "^- O-inplexicaulis. 



pl^JJt ^P^'"i"gl>' hirsute or scabrous. 3 w rohn'itn 



r„ 1 .Plant densely pubescent. ^- „/ '^<'""*'<?- 



Involucral bracts unequal, the outer much shorter, in 5-6 series; stem^wWte.""''" 



5. W. scabra. 



