COMPOSITE. (COMPOSITE FAMILY.) 167 



pappus copious and simple, of rather rigid and unequal bristles: leafy- 

 stemmed (Did branching, the showy heads terminating the branches, the invo- 

 lucre canescent or even viscid, and the leaves from dentate to bipinnalely-parted. 

 — Mac ilekaxtuera. 



* Involucre densely hispidulous as well as viscid, very squarrose: akenes gla- 



brous or glabrate: leaves from incisely dentate to entire, the teeth hardly at all 

 bristle-tipped: rays bright violet. 



36. A. Pattersoni, Gray. A span or two high, branched from the summit 

 of (he tap-root .- steins or branches with soft or cottony pubescence or glabrate : 

 leaves thickish, spatulate or Ungulate, entire or coarsely few-toothed, none widened 

 at base: heads solitary or few: involucral bracts lanceolate: rays about 30, 

 fully £ inch long. — Proe. Am. Acad. xiii. 272. Machosrantkera canescens, 

 var. alpina, Porter, Fl. Colorad. 59. Moist ground along streams, Gray's 

 Peak, Colorado. 



37. A. Bigelovii, Gray. A foot or two high, robust : stem leafy, branch- 

 ing above, rouyhtsh-htrsute to glabrate; the flowering branches or peduncles glandu- 

 lar-hirsute, terminated by showy large heads : leaves oblong or lanceoleite, 

 irregularly and sometimes mcisely dentate, sometimes entire ; radical lanceolate- 

 spatulate ; cauline oblong to lanceolate, usually with broadish partly clasping 

 base : involucral bracts very numerous, linear-attenuate or the prolonged and 

 much recurved tips almost filiform : rays very many, an inch or less long. — 

 Pacif. R. Rep. iv. 97. Colorado and Xew Mexico. 



* * Involucre from nearly glabrous to glandular-puberulent, but not hispidulous: 

 akenes densely pubescent or villous: leaves generally with bristle-tipped teeth. 



-t- Leaves at most incisely dentate. 



38. A. ColoradoensiS, Gray. A span or less high, forming a tuft oj 

 short few-leaved stems on a strong tap-root, caneseently pubescent, not at all 

 glandular : leaves spatulate or obianceolate, about an inch long, coarsely den- 

 tate, the teeth tipped with conspicuous bristles : heads solitary, broadly hemi- 

 spherical, j inch high : involucral bracts small and numerous, well imbricated, 

 subulate-lanceolate : rays 35 to 40, violet-purple, barely £ inch long : akenes 

 densely caneseent-villous, £ the length of the comparatively rigid pappus. — 

 Proc. Am. Acad. xi. 76. Common in South Park, Colorado, and at the San 

 Juan l'as<. 



39. A. canescens, Pursh. Commonly a foot or two high and loosely 

 much branched, bearing numerous paniculate heads, sometimes dwarf and with 

 simple contracted inflorescence, pale and cinereous-puberulent or minutely 

 canescent, or greener aud glabrate : leaves lanceolate to linear, or the lower 

 spatulate, from entire to irregularly dentate, or occasioned! y lac/mate, the rigid 

 teeth mostly with mucronate tip : involucre of rigid usually well-imbricated 

 bracts: rays violet, 4 or 5 lines long: akenes narrow, canescent. — Fl. ii. 547. 

 Macha • raulhera canescens and .1/. pulveruienta of the Western Reports A 

 polymorphous species. From Arizona to Texas and northward to British 

 Columbia and the Saskatchewan. 



Var. latifolius, Gray. Green, minutely soft-pubescent, 2 feet or more 

 high : leaves thinnish, nearly membranaceous, comparatively large, some- 

 times spatulate-oblong, and over ^ inch wide : heads large and few: involucre 

 hemispherical ; tips of its bracts mostly attenuate-subulate and squarrose- 



