COMPOSITE. (composite FAMILY.) 201 



cauline leaves pinnately 5 to VtHinded, and divisions S^parted into spatulate^tnc^.r 

 lobes; uppermost siinp!y 3 to 5-parted or entire : invijlucre 2 iiuea bioad. i;<7. 

 Ions; its bracts browu-mar^iued : corollas hirsute at summit.— Proc. Acad. 

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



8. A. frigida, VVilld. Herbaceous from a su//'rutesrent base, silkv-canen- 

 cent and sih-eri/, about a foot high ; stems simj)le or branching, beuriufj numerous 

 racemoselii disposed heads in an open panicle: leaves ma inlij twice teruatclij or 

 quinateJy divided or parted into linear crowded lobes, and usually a pair of (<im. 

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

 barely 2 lines in diamc:or: involucre pale, cancsrmt, its outer bracts narrow 

 and herbaceous: corollas glnhrnus. — Frorx Idinncsota to Texas and west- 

 ward to New Mexico, Nevada, and Idaho. 



« « Receptacle not rilhms. 

 4- Annual and hienniaL 



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

 stem strict, J to 3 feet high, leafy to the top, bearing close gJomerules of small 

 heads in the axib from toward the- ba.-e o£ the stem to the somewhat naked 

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

 broadly linear laciniate or incisely toothed lobes; or the up])ermost small, 

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

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

 south. 



-t- -t- Perennials. 

 *+ Heads many-flowered y broad {2 to 5 lines)^ several or numerous and looscli/ 

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

 sected leaves and no cottony tommtum. 



10. A. Norvegiea, Fries. Uather stout, 5 to 25 inches high, from villous 

 Krr pubescent to glabrate : leaves tivice 3 to 7-parred into linear or lanceolate cr 

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

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

 margined : corollas loosely pilose, rarely almost glabrous. — Mostly .1 arrtica 

 of the Western Reports^ From the high mountains of S. Colorado and 

 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-i^d uncled 

 heads .' leaves 2 to 3-pinnatel'/ parted into mostly linear thickish lol)es : inrolunr 

 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 da Cristo Pass. 



*+ -M. Heads comparatively small {\ to 3 lines hirjh and broad). !2 to many 

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

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



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

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



12. Ao serrata, Mutt. Stems 6 to 9 feet high, very leafy : loaves tn'oen and 

 glabrous above, white-iomentose beneath, lanceolate or uppermost linear. a/I 

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



