COMPOSITES. (COMPOSITE FAMILY.) 201 



cauline leaves pinnately 6 to t -divided, and divisions 3-parted into spatulate- 

 linear lobes ; uppermost simply 3 to 5-parted or entire ; involucre 2 lines broad, 

 villous; its bracts brown-margined : corollas hirsute at summit. — Proc. Acad. 

 Philad. 1863, 66. Alpine region, mountains of Colorado, Utah, and Wyoming. 



8. A. frigida, Willd. Herbaceous from a suffndesccnt base, silky-canes- 

 cent and silvery, about a foot high : stems simple or branching, bearing 

 numerous racemosely disposed heads in an open panicle : leaves mainly twice 

 ternately or quinately divided or parted into linear crowded lobes, and usually a 

 pair of simple or 3-parted stipuliform divisions at base of the petiole : heads 

 globular, barely 2 lines in diameter : involucre pale, canescent, its outer bracts 

 narrow and herbaceous: corollas glabrous. — Froru Minnesota to Texas and 

 westwai'd to New Mexico, Nevada, and Idaho. 



* * Receptacle not villous. 

 +- Annual and biennial. 



9. A. biennis, "Willd. Wholly glabrous, inodorous and nearly insipid : 

 stem strict, 1 to 3 feet high, leafy to the top, bearing close gloinei'ules of small 

 heads in the axils from toward the base of the stem to the somewhat naked 



„3»and spiciform summit: leaves 1 to 2-pinnately parted into lanceolate or 



2 broadly linear lacinlate or incisely toothed lobes ; or the uppermost small, 



'-J sparingly plnnatifid and less toothed. — Open grounds from California and 



_. Oregon to Hudson Bay ; also now spreading to the eastern seaboard farther 



■S south. 



t - 



CS ' +■ +- Perennials. 



*-*"" ++ Beads many-flowered, broad (2 to 5 lines), several or numerous and loosely 

 racemose or paniculate on mostly simple stems : alpine and subalpine, with 

 & dissected leaves and no cottony tomentum. 

 *-" 10. A. Norvegica, Fries. Rather stout, 5 to 25 inches high, from vil- 

 5 lous or pubescent to glabrate : leaves twice 3 to 7-parted into linear or lanceo- 

 late or more dilated segments : heads i or 5 lines broad, loosely racemose or 

 •9 racemose-paniculate, most of them long-peduncled': bracts of the involucre 

 <§, broadly brown-margined : corollas loosely pilose, rarely almost glabrous.— 

 '.'" Mostly A. arclica of the Western Reports. From the high mountains of S. 

 i ' Colorado and S. California far northward. 



11. A. Parryi, Gray. Rather stout, a foot or less high, wholly glabrous, 

 leafy up to the loosely paniculate inflorescence of numerous short-pedunclecl 

 heads : leaves 2 to 3-pinnately parted into mostly linear thickish lobes : involu- 

 cre 2 or 3 lines broad, its bracts greenish with brownish margins and with the 

 corollas glabrous. —Proc. Am. Acad. vii. 361. Mountains of Colorado, at 

 Sangre de Cristo Pass. 



++ ++ Heads comparatively small (1 to 3 lines high and broad), 12 to many- 

 flowered, variously paniculate ; flowers glabrous : herbs, mostly whitened (at 

 host lohenymtng amdontU lower surface of the leaves) with cottony tomentum. 



= Tall, with numerous amply paniculate heads, strict stems, and undivided 

 elongated-lanceolate or linear leaves, 3 to 1 inches long. 



12. A. serrata, Nutt. Stems 6 to 9 feet high, very leafy : leaves green and 

 cdabrous above, white-tomentose beneath, lanceolate or uppermost linear, all 

 "serrate ivith sharp narrow teeth, pinnately veined, the earliest sometimes pin- 



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