918 CARDUACEAE 



14. A. confinis Greene. Cespitose, somewhat suffrutescent perennial; 

 stem 1-2 dm. high, tomentose; leaves of the rosettes oblong-spatulate, about 1 

 cm. long, tomentose on both sides; tomentum loose; heads usually peduncled, 

 numerous, in a corymbiform inflorescence; involucres about 5 mm. high; bracts 

 of the pistillate ones oval to oblong, obtuse, brownish or yellowish, those of the 

 staminate heads somewhat broader. Mountains: Ida. — Ariz. — Calif. — Ore. 

 Mont. Je-Jl. 



15. A. aizoides Greene. Stolons ascending; stem 3-8 cm. high; leaves of 

 the stolons thick, 10-15 mm. long, with a very fine silvery-white shining tomen- 

 tum; stem-leaves linear or hnear-oblanceolate; heads 2 or 3, sessile; involucres 

 4-5 mm. high, densely tomentose at the base; bracts of the staminate heads 

 ovate to obovate, dark brown, rounded at the apex. Barren hills and mountains: 

 Sask. — B.C. Plain. Je-Au. 



16. A. umbrinella Rydb. Stem about 1 dm. high; leaves of the rosettes 

 spatulate, 1-1.5 cm. long, densely white-tomentose; stem-leaves linear-oblong; 

 heads 3-8, conglomerate; involucres about 5 mm. high; bracts of the staminate 

 heads elliptic, obtuse, isabel-colored (dirty yellowish), those of the pistillate heads 

 similar, but darker, usually hght umber-colored, and the inner narrower. Higher 

 mountains: Mont. — Colo. — B.C. Mont. — Alp. 



17. A. Macounii Greene. Stem 5-15 dm. high; leaves of the stolons obo- 

 vate or spatulate, 1-1.5 cm. long, sometimes yellowish; heads 3-8 in a close 

 glomerate cluster; bracts of the staminate heads brown, elliptic or oval, very 

 obtuse, more or less spreading; outer bracts of the pistillate heads oblong, obtuse, 

 the inner ones linear-lanceolate, acute. A. reflexa E. Nels., mainly. Moun- 

 tains: Alta. — Wyo. — B.C. My-Au. 



18. A. conciiina E. Nels. Stem slender, 10-15 cm. high; leaves of the 

 rosettes spatulate or obovate, scarcely petioled, abruptly acute, about 1 cm. long, 

 2-4 mm. broad, white-tomentose with rather loose tomentum; stem-leaves 

 linear-oblong or linear; heads 6-15, conglomerate or in more open clusters; bracts 

 of the pistillate heads elliptic, obtuse, the outer brownish, the inner pinkish. 

 Hills: Wash. — Ore. — Colo. — Wyo. Submont. — Mont. Je-Jl. 



19. A. rosea (D. C. Eat.) Greene. Stem 2-4 dm. high, slender, tomentose; 

 leaves of the rosettes acute, 15-20 mm. long, white-tomentose, with close tomen- 

 tum; heads asually many; involucres about 5 mm. high and broad; bracts of the 

 rare staminate head broadly elliptic, pale pink, those of the pistillate heads 

 elliptic to linear-oblong, obtuse, rose or rarely dull white. A. dioica rosea D. C. 

 p]at. i4. pann/oZia [? Nutt., in part] Rydb. A. sordida Greene. Meadows: Alta. 

 - — S.D. — Colo. — Calif. — Yukon. Plain — Subalp. Je-Au. 



20. A. imbricata E. Nels. Stem 1-3 dm. high; leaves of the rosettes 

 mucronate, petioled, about 2 cm. long, grayish-tomentose, with appressed tomen- 

 timn; stem-leaves ample, oblong or (iljlaucfdlatc; heads in a close cluster; invo- 

 lucres hemispheric, about 7 mm. high and broad; bracts of the pistillate heads 

 pinki.sh, elliptic, obtuse or the inner rarely acutish. A. rosea imbricata E. Nels. 

 Hills: Alta.— Colo. Je-Jl. 



21. A. corymbosa E. Nels. Stem 2-3 dm. high; leaves of the rosettes thin, 

 sparsely tomentose, with api)rcssed tomentum, 3-3.5 cm. long; stem-leaves 

 linear, acuminate; heads jxHUmcled, corymbose; involucres 4-5 mm. high; bracts 

 of the pistillate heads elliptic and obtuse or the innermost lanceolate and acute, 

 those of the staminate j)lant broadly oval and rounded at the apex. A. nardina 

 Greene. Meadows: Mont. — Colo. — Ida. — Ore. Submo7it. — Subalp. 



22. A. foliacea Greene. Stem 3-4 dm. high; leaves of the rosettes cuneate- 

 obovate or broadly .sjjatulate, 1-2 cm. long, white-tomentose on both sides, with 

 rather loose tomentum; stem-leaves ample, 2-3 cm. long; heads many, pcdicelled, 

 corj'^mbose; involucres about G mm. high; bracts of the pistillate heads dirty 

 white, the outer oblong or ellii)tio, obtuse, the inner linear-lanceolate, acute; 

 staminate i)lant unknown. Mountains: Mont. Submont. Am. 



23. A. sedoides Greene. Stem about 1 dm. high; leaves of the rosettes 

 spatulate, less than 1 cm. long, densely and finely white-tomentose on both sides; 



