COMPOSITE. (COMPOSITE FAMILY.) 201 



caullne leaves pinnately 5 to ^-divided, and divisions 3-parted into spatulate-linear 

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

 loits ; 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 suffrutescent 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 ternateiy or 

 quinateli/ 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 diameter : involucre pale, canesc.ent, its outer bracts narrow 

 and herbaceous : corollas glabrous. From Minnesota to Texas and west- 

 ward to New Mexico, Nevada, and Idaho. 



* * Receptacle not r,'ilous. 

 *- 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 glomerules of small 

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

 and spiciform summit : leaves 1 to 2-piunately 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's Bay; also now spreading to the eastern seaboard farther 

 south. 



-t- (- Perennials. 



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

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

 sected leaves and no cottony tomentum. 



10. A. Norvegica, Fries. Rather stout, 5 to 25 inches high, from villous 

 or pubescent to glabrate : leaves twice 3 to 1 -parted into linear or lanceolate or 

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

 paniculate, most of them long-peduncled : 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 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-peduncled 

 heads : leaves 2 to 3-pinnate!'/ 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 

 Saugre 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 

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



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

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



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

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

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



