164 COMPOSITE. (COMPOSITE family.) 



thyreoid panicle of numerous subsessile heads : upper leaves rather broadly 

 oblong and with broad half-clasping base obscurely auriculate : bracts of the 

 involucre imbricated, with small and erect lanceolate green tips, only in some 

 heads a few of the outermost loose and foliaceous, but seldom equalling the 

 disk. — Loc. cit. A. Canbyi, Vasey. On White River in Western Colorado, 

 Vase//. 



Var. Eatoni, Gray. Rather tall, 2 or 3 feet high, branching, bearing 

 numerous and smaller paniculate or glomerate heads, and comparatively nar- 

 row lanceolate leaves : involucre loosely imbricated ; outer and sometimes 

 inner bracts foliaceous, either erect or squarrose-spreading. — Loc. cit. 194. 

 British Columbia to California and northeastward to Montana. 



*+ ++ Base of most of the cauline leaves auriculate- or cordate-clasping. 



23. A. punieeus, L. Stem commonly 3 to 7 feet high, loosely branch- 

 ing above, rather stout, often red or purple, hispid with spreading bristles : 

 leaves 3 to 6 inches long, oblong-lanceolate, acuminate, from coarsely and 

 irregularly serrate to sparingly denticulate or sometimes entire, commonly 

 scabrous above and ofteu hispid along the midrib beneath : heads (4 to 6 

 lines high) subsessile, either sparsely paniculate or thyrsoid-crowded : invo- 

 lucre of loose and thin soft and narrowly linear merely herbaceous bracts : 

 rays 4, inch long, violet, varying to purple or occasionally white. — Through- 

 out the Eastern States and extending into our range through the Dakotas. 



§ 2. Pappus double: involucral bracts narrow and oppressed, well imbricated : 

 rays 10 to 18, violet: akenes narrow, villous: low and tufted plants, with 

 rigid stems thickly beset with small linear or lanceolate entire and rigid leaves. 

 — Ianthe. 



# Head 4 inch high, broad, solitary: akenes fiat, with strong nerves. 



24. A. scopulorum, Gray. Puberulent and somewhat cinereous: stems 

 tufted, rigid, only a span high, terminated by a solitary pedunculate head : 

 leaves short, 3 to 6 lines long, rigid, from oblong to linear or the lowest spatulate, 

 the broader obtuse with an abrupt mucro, callous-margined : involucre broadly 

 campanulate ; its bracts imbricated in about 3 series, scabro-puberulent, lanceo- 

 late : rays 4, inch long, light violet : outer pappus sometimes distinctly chaffy. 

 — Proc. Am. Acad. xvi. 98. Diplopappus alpinus, Nutt. Mountains of Mon- 

 tana and Wyoming to Nevada and California. 



25. A. Stenomeres, Gray. More slender, G to 10 inches high, green, 

 minutely scabrous: solitary naked pedunculate head larger: leaces all linear, 

 4, lu 1 inch long, a. line wide, acutely mucronate, hardly margined : involucre 

 broad ; its bracts barely in two moderately unequal series, linear, thinnisb, often 

 pubescent : rays pale violet, over £ inch long : outer pappus setulose. — Proc. 

 Am. Acad. xvii. 209. — Mountains of Montana and Idaho. 



* * Heads J to J inch high, narrow: akenes less compressed, lightly few-nerved: 

 outer pappus of few or indistinct unpi/nal short bristles. 



26. A. ericsefolius, Rothrock. About a span high, cauescent and 

 glandular-scabrous, much branched : branches erect or diffuse, terminated by 

 somewhat pedunculate beads : leaves commonly hispid-ciliate, erect or little 

 spreading, 3 to 6 lines long; lowest spatulate and tapering into a petiole; 



