OOMPOSITiE. (COMPOSITE FAMILY.) 147 



petiole or tapering base); cauliue lanceolate, or small uppermost linear: 

 heads solitary or 2 or 3 in axils, smaller than in foregoing: involucre] bracts 

 narrowly oblony to linear-lanceolate, some loose outer ones usually equalling the 

 disk and more foliaceous : rays bright yellow, half-inch long: immature akenes 

 oblong. — Gray, Proc. Am. Acad. xvi. 79. Mountain meadows, Wyoming, 

 and Montana. 



h_ 4_ .»_ Heads conspicuously radiate, smaller: rays | to barely \ inch long: 

 akenes silky pubescent or villous. 

 ++ Mostly simple stems with a tuft of radical leaves : leaves coriaceous, entire or 

 spinulose-serrate, the cauline diminished upwards: rays 20 to 50: pappus 

 pale, rather soft and fine. 



5. A. uniflorus, Torr. & Gray. Stems a span to barely a foot high, 

 ascending or erect, sometimes 5 to 6-leaved, sometimes rather scapiform or upper 

 leaves reduced and bract-like, bearing a solitary head, rarely one or two from 

 lower axils : leaves lanceolate or sometimes broader ; radical 2 or 3 inches 

 long and usually petioled : involucre commonly £ inch high and the linear or 

 oblong-linear bracts all of same length, rather loose, outer all foliaceous. — A. uni- 

 florus & A. inuloides, Torr. & Gray, Fl. ii. 241. From the Saskatchewan to 

 Montana, Utah, and Colorado. 



6. A. laneeolatUS, Torr. & Gray. Habit of the preceding: stems gen- 

 erally more leafy and bearing 3 to 15 heads; these when few subcorymbose, 

 when more numerous racemosely or paniculately disposed : involucre in the 

 type fully ^ inch high ; its bracts rather closely imbricated in 3 or 4 unequal 

 series, lanceolate, acutish, with short green tips and whitish coriaceous base ; 

 outer successively shorter, occasionally some of them longer and more herba- 

 ceous. — Eaton, Bot. King Exp. 160. From the Saskatchewan to British 

 Columbia and N. Nevada. 



Var. Vaseyi, Parry. Heads a third or quite half smaller, disposed to 

 be racemose and involucre closer. — Saskatchewan to Wyoming, Utah, and 

 Colorado. 



** ++ Very dwarf from a multicipital caudex, leafy up to the small heads: leaves 

 all narrow and entire : rays 7 to 10 : pappus scanty, somewhat fulvous. 



7. A. multicaulis, Gray. Very dwarf, tufted, tomentulose, but early 

 glabrate and smooth : stems 1 to 3 inches high from a ligneous caudex, simple 

 or forked, bearing 3 or 4 leaves and few heads : leaves narrowly linear, or the 

 lowest obscurely spatulate, an inch long : bracts of the involucre large and 

 rather few (9 to 14), from ovate to oblong-lanceolate, cuspidate-acuminate, 

 marked with a green spot below the slender cusp, or the outermost with a 

 larger foliaceous tip. — Am. Nat. viii. 213. On rocks, mountains of N. W. 

 Wyoming. 



++++++ Branching and leafy : leaves not rigid, dentate or pinnatifid, the teeth 

 and tips bristle-tipped: rays conspicuous, 15 to 30 : pappus rather rigid, its 

 bristles very unequal in size and strength. 



8. A. rubiginosus, Torr. & Gray. One to three feet high, viscid-glan- 

 dular and pubescent: leaves lanceolate or narrowly oblong, inciselu pinnatifid or 

 dentate with salient narrow teeth : heads somewhat cymosely paniculate, 5 or 6 

 lines high, usually naked pedunculate : bracts of the involucre linear-subulate, 



