COMPOSITE. (COMPOSITE FAMILY.) 167 



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

 stemmed and branching, the showy heads terminating the branches, the invo- 

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

 MACH.ERANTHERA. 



* Involucre densely hisptdulous 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. Patterson!, Gray. A span or two high, branched from the summit 

 of the tap-root : stems 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, 

 fullv inch long. Proc. Am. Acad. xiii. 272. JMachieranthera 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, roughish-hirsttte to glabrate; the flowering branches or peduncles glandu- 

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

 irregularly and sometimes incise!.;/ dentate, sometimes entire ; radical lanceolate- 

 spatulate ; cauliue oblong to lanceolate, usually with broad ish partly clasping 

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

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

 Pacif. R. Eep. iv. 97. Colorado and New Mexico. 



# # Involucre from nearly glabrous to gland ular-puberulent, but not litsj>idulous: 

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



- Leaves at most incisely dentate. 



38. A. Coloradoensis, Gray. A span or less high, forming a tuft of 

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

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

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

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

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

 densely canescent-villous, the length of the comparatively rigid pappus. 

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

 Juan Pass. 



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 and glabrate : leaves lanceolate to linear, or the lower 

 spatulate, from entire to irregularly dentate, or occasionally laciniate, 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. 

 Machver anther a canescens and M. pulverulenta 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- 



