920 CARDUACEAE 



32. A. campestris Rydb. Stem low, about 1 dm. high or less; leaves of 

 the rosettes obovate-cuneate, 2-4 cm. long and about 1 cm. wide, glabrate above, 

 tomentose beneath; stem-leaves small, linear, acute; heads 3-6, sessile, con- 

 glomerate; involucres of the pistillate heads 8-9 mm. high, outer bracts oblong, 

 obtuse, the inner linear-lanceolate, acute or acuminate; staminate involucres 6-7 

 mm. high; bracts elliptic or obovate, rounded. A. Lunellii and A. athabascensis 

 Greene. Prairies: Man. — Mich. — Mo.^ — Kans. — Sask. — (? B.C.). Plain. My- 

 Je. 



33. A. marginata Greene. Stem 1-2 dm. high; leaves spatulate or ob- 

 lanceolate, obtuse or mucronate, 1-2.5 cm. long, glabrate above, densely but 

 loosely white-tomentose beneath; heads 4-8, conglomerate, but short-pedicelled ; 

 involucres of the pistillate plant 8-10 mm. high; outer bracts oblong, obtuse, the 

 inner linear-lanceolate, acute; involucres of staminate heads 6-7 mm. high; bracts 

 obovate or rhombic-obovate, obtuse, acutish or abruptly short-acuminate. Hills 

 and mountain sides: N.M. — s Colo. — Utah — Ariz. Submont. — Mont. Je-Jl. 



34. A. rosulata Rydb. Plant almost acaulescent; stem 1 cm. long or less; 

 leaves of the rosettes 5-10 mm. long, spatulate or spatulate-obovate, densely 

 and closely silvery-tomentose ; heads 1-3 together, sessile; involucral bracts of 

 the pistillate heads lanceolate, acute, milky white, those of the staminate ones 

 oval or obovate, rounded. A. Bakeri Greene. Mountains: Colo. — Utah — Ariz. 

 Submont. — Mont. My-Jl. 



35. A. Sierrae-Blancae Rydb. Rosulate, almost stemless; leaves broadly 

 spatulate, less than 1 cm. long, abruptly acute; heads subsessile in the rosettes, 

 6-7 mm. in diameter; bracts broadly oblong to ahnost obovate, with a scarious 

 brown upper portion. High mountains: s Colo. Alp. 



36. A. oblanceolata Rydb. Stem 2-A dm. high, slender; basal leaves 3-6 

 cm. long, evidently 3-ribbed, densely white-tomentose; upper stem-leaves linear; 

 heads corymbose; involucres 4-5 mm. high; bracts brownish, with white or straw- 

 colored tips, those of the pistillate heads oblong to linear, the outer obtuse, the 

 inner acute, those of the staminate heads oval and rounded. Mountain sides: 

 Mont. — Colo.^ — Calif. — B.C. Submont. — Mont. Je-Au. 



37. A. luzuloides T. & G. Stem 2-4 dm. high; leaves 5-7 cm. long, 1-4 

 mm. wide, densely silky white-tomentose; heads numerous, coiymbose; invo- 

 lucres 4-5 mm. high, nearly glabrous throughout; bracts of the pistillate heads 

 brownish and shining, the outer ovate, the inner linear-oblong, mostly obtuse; 

 those of the staminate heads broader, rounded and white-tipped. Valleys and 

 hillsides: Mont.— Wyo.— Ore.— B.C. My-Jl. 



38. A. lanata (Hook.) Greene. Basal leaves narrowly oblanceolate, 4-8 cm. 

 long, loosely white-tomentose; stem-leaves linear; heads several, conglomerate; 

 involucres densely tomentose below, those of the pistillate heads 6-8 mm. high, 

 those of the staminate 5-6 mm. high; bracts of the former in 5 or 6 series, dark 

 brown or abuost black with light brown tips. High mountains: Alta. — Mont. — 

 Ore.— B.C. Mont.— Alp. Je-Au. 



39. A. pulcherrima (Hook.) Greene. Stem 3-5 dm. high; basal leaves 

 oblanceolate, 8-12 cm. long; stem-leaves narrower; heads several, corymbose; 

 involucres of the pistillate heads nearly 1 cm. high, more or less turbinate; bracts 

 in 6 or 7 series, the outer broadly ovate, obtusish, the inner narrowly lanceolate, 

 acuminate, all with dark brown bases and light bro\m or dirty white tips; stam- 

 inate involucres 5-6 mm. high; bracts with rounded obovate tips. A. carpathica 

 pulcherrima Hook. Hillsides and mountains: Sask. — Colo. — Wash. — Yukon. 

 Submont. — Subalp. 



40. A. anaphaloides Rydb. Stem 3-4 dm. high, stout; basal leaves 

 narrowly oblanceolate, 10-15 cm. long, acute; heads many in an open corymb; 

 involucres of the staminate and pistillate heads much alike, 6-8 mm. high; bracts 

 in 3-4 series, with white tips, in the pistillate heads obtuse or acutish, in the 

 staminate heads rounded or trimcate at the apex. A. pulcherrima Coult. & 

 Nels., not Greene. Hillsides: Mont. — Colo. — Ore. — B.C. Submont. — Subalp. 

 My-Au. 



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