V. 



916 CARDUACEAE 



Bracts of the pistillate heads acute, at least the inner ones 



Inflorescence and upper leaves glandular-hairy; leaves of the inflorescence 



large, scarcely smaller than the upper stem-leaves; bracts greenish 

 l^eaves of the stolons 5-15 nun. long, rhombic-spatula te; tomentum very 



hne, appressed and silky. 26, A, microphylla. 



Leaves of the stolons spatulate. usually rounded at the apex. 15-30 mm 

 long, tomentiun looser. 27 A bracteosa 



Inflorescence and upper leaves not glandular, the latter ' reduced :* bracts 

 brownish. 28. A. oxyphylla. 



VI. Apric.^^. 

 Plant tall, 2-3 dm. high; heads usually peduncled. 



Leaves less than 2 cm. long and 5-8 mm. wide, usually not triple-nerved- heads 7-9 



mm. nigh. 28 A oxunhfjJJn 



Leaves over 2 cm. long, 7-10 mm. wide, triple-nerved; heads about 1 cm lugh. 



Plant low, usually less than 1 dm. high; heads subsessile. 3o. A. ap^rica^' 



YII. Campestres. 



Plant about 3 dm. high; basal leaves distmctly triple-nerved. 31. A. HoweUii 



Plant 1 dm. or less; basal leaves not distinctly triple-nerved ^^'ju.i^uu. 



Inflorescence not glandular^ of the pistillate heads lanceolate or llnear-Ianceo- 



late, acute; those of the stammate heads oblong, obtuse. 32. A, camprsMs 



^'^2:?^.l^J^^^..'^.ri T„ llf? ll^Ji?^l?^-i^^i^>" bracts in both heads ovate to lanceolate. 



stammate 



33. A, niarginata. 



VIII. ROSUL.VTAE. 



Bracts with white upper portion; leaves white on both sides. 34. A. rosulala. 



brown 



35. A. Sierrae-Blancae, 



white. 



■n 1 , X., . . ^^- Argenteae. 



Basal leaves oblanceolate. oc a nhinnrpnintn 



Basal leaves very narrowly Unear-oblanceolate. 3?; 2\ luzuloides 



X. PULCHERRIMAE. 



Bracts with a large dark spot, those of the pistillate heads ovate to lanceolate acute 



»nS^.Tge^^f^Ite^^^^^^^^ ^^'^^' ^*^^-^ - --^-^= ^^'^^^ ^-d' 



Plants 1-2 dm. high; ribs of the leaves not conspicuous; outer bracts wholly fuscous. 



t>,.... o_5 dm. liigh; leaves with conspicuous ribs; tips of tife b^'actstrawnish or 



x.i«,uts vviiii small dark spots or none; bracts of both staminate and pistiUate''heads''with 

 oblong or oval, obtuse tips, those of the staminate heads slightly broader! 



_, „ 40. A. anaphaloides. 



Plant without filiform stolons. 



Fruitmg heads not over 1.5 cm. high; leaves oblanceolate; stem 1-3 cm. high. 



Fruiting heads about 2 cm. high; leaves spatulate, loosely tomentose?'^te'm 3-5 cm. 

 Plants wfth flUform ascending stolons. t ± Z"/K'"'" 



1. A. racemosa Hook. Stem of the pistillate plant 2-5 dm. high, glabrous 

 or puberulent; leaves of the rosettes 3-ribbed, petioled, 3-7 cm. long, white- 

 tomentose beneath, glabrate above; stem-leaves lanceolate or linear, sessile : 

 heads many; involucres 6-8 mm. high and about as broad; bracts ovate to laaceo- 

 late, acute, hght greenish yellow; stem of staminate plant 1-3 dm. high; invo- 

 lucres more hemispheric, 5 mm. high; bracts elliptic, obtuse, the inner slightly 

 ^■liite-tipped. Woods and hillsides: Alta.— Wyo.— CaUf.— B.C. SuhmonL— 

 Mont. Je-Au. 



2. A. oblancifolia E. Nels. Stem of the staminate plant 1-2 dm. high; 

 basal leaves oblanceolate, 2-3 cm. long, sparingly tomentose or glabrate above, 

 appressed, white-tomentose beneath; stem-leaves narrowly oblanceolate or 

 linear, acute or acummate; heads 4-13; involucres 4r-5 mm. high, sparsely woolly; 

 bracts oval, obtuse, or rounded, hght broAvmish green below, often with a pur- 

 plish spot and white tips. Wooded slopes: w Wyo. Moid. Jl. 



3. A. alpina (L.) Gaertn. Stem 5-15 cm. high, floccose; leaves of the 

 stolons silkj-tomentose 8-20 mm. long, 2-4 mm. wide; heads usuaUy 3-5, con- 

 glomerate; involucres about 5 mm. high and 8 mm. broad; bracts of the very 

 rare stammate head pale, elhptic, obtuse, those of the pistillate heads dark green- 

 ish brown, lanceolate, long-acuminate. Arctic-alpine situations: Greenl.— Lab. 

 —Alta. — B.C.; n Eur. Alp. Jl-Au. 



