COMPOSITE. (COMPOSITE FAMILY.) 201 



cauline leaves pinnately 5 to 7-divided, and divisions 3-parted into spatulate-lineir 

 lobes; uppermost simply S to 5-parted or entire : involucre 2 iines broad, vil- 

 lous ; 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 sufrutescent base, si Iky -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 sim- 

 ple or 3-parted stipuliform divisions at base of the petiole : heads globular, 

 barely 2 lines in diamcior: involucre pale, canescent, its outer bracts narrow 

 and herbaceous : corollas glabrous. — Fror\ Minnesota to Texas and west- 

 ward to New Mexico, Nevada, and Idaho. 



* * Receptacle not villous. 

 •*- Annual and biennial. 



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

 stem strict, 1 to 3 feet high, leafy to the tcp, bearing close glomerules of small 

 heads in the axib from toward the base o£ the stem to the somewhat naked 

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

 broadly linear laciniate or incisely toothed lobes; or the uppermost small, 

 sparingly pinnatifid and less toothed. — Open grounds from California and 

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

 south. 



•*- <*- Perennials. 

 *•*■ Heads many-flowered, broad (2 to 5 lines), several or numerous and loosely 

 racemose or paniculate on mostly simple stems i alpine and subalpine, witJi dis- 

 sected leaves and no cottony tomentum. 



10. A. Norvegica, Tries. Father stcut, 5 to 25 inches high, from villous 

 <rr pubescent to glabrate : leaves twice 2 to 7-parted into linear or lanceolate cr 

 more dilated segments : heads 4 or 5 lines broad, looseiy racemose or racemose- 

 paniculate, most of them long-pedunchd : bracts of the involucre broadly brown- 

 margined : corollas loosely pilose, rarely almost glabrous. — Mostly A, arctica 

 of the Western Reports. From the high mountains of S. Colorado aud 

 S. California far northward. 



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

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

 heads s leaves 2 to 3~pinnalel;i parted into mostly linear thickish lobes : involucre 

 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); !2 to many- 

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

 least when young and on the lower surface of the leaves) with cottony tomentum. 

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

 gated-lanceolatz or linear leaves, 3 to 7 inches long. 

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

 glabrous above, white-iomentose beneath, lanceolate or uppermost linear, all 

 serrate with sharp narrow teeth, pinnately veined, the earliest sometimes pin 



