ASTER COMPOSIT-^E 311 



EUCEPHALOS 



over 2 feet high, rather stout : cauline leaves mostly narrowed below and 

 with more or less auriculate half -clasping; base : the lower 5 inches long by 

 an inch broad, nnt petiolar-contracted : heads terminating, simple leafy 

 branches : rays 8-9 lines long. Between Kootenay and Pend Orielle, Wash- 

 ington. 



A. Henderson! Ferhald. Stems rather slender, loosely tomentose 

 above, branching near the top, leafy : upper leaves lanceolate, more or 

 less acuminate, entire, one-nerved, glabrous except the midrib, auriculate. 

 clasping by a broad base, 2-4 inches long : heads numerous, in an ample 

 panicle : bracts of the involucre linear, acute, green or the inner wi h whi- 

 tish base, all of nearly equal length, equalling- or surpassing the disk. 4-5 

 liiies'iong: rays numerous, 8-10 lines long by a iine broad, bright purple. 

 Eastern Washington to Idaho. 



18 BUCEPHALUS Nutt. trans. Am. Phil, Soc. vii,'298. 



Perennial leafy-stemmed herbs without radical leaves and 

 solitary or panicled heads of purple, blue or white ray-flowers 

 in a single series, not very numerous, pistillate: disk flowers 

 tubular and perfect. Bracts of the turbinate campanulate in- 

 volucre regularly imbricated in 3-4 series, dry and chartaceous, 

 ovate, concave, somewhat carinate, the innermost about the 

 length of the disk, the outer successively shorter but similar. Al- 

 veola of the receptacle lacerate. Appendages of the style lanceo- 

 late, acute. Achenes oblong, compressed. Pappus copious, 

 rather longer than the corolla: the bristles unequal; the longest 

 ones sometimes thickened upwards. Stems very leafy,the lower 

 leaves being reduced to bract-like scales, or bristles. 



B. elegans Nutt. Trans. Am. Phil. PoC vii, 298. Atter ekgans 

 T. & G. Stems slender, 1-3 feet high, mostly scabro puberu- 

 lent, leaves thickisb, iancew>l?.t?, 1-2 inches long, erect, closely sessile, the 

 upper apiculate-mucronate : heads several at the summit of simple stems 

 or branches, 4-5 lines high: bracts of the involucie al close and conspicu- 

 ously wooUy-ciliate, barely acute, outer ovate, none with pointed tips : 

 rays rather few, about 4 lines long: style appendages linear- subulate, 

 hai'dly acute, equaling the stigma ic portion : auhenes flat, hirsute, becom- 

 ing glabrate at maturity. On mountains of Eastern Oregon and Wash- 

 ington to Montatia, Wyoming and Nevada. 



E. Engelmannii Greene Pitt, iii, 54. Aster Engelmanii Gray 

 Commonly, rather tall and robust, green, slightly puberulent 

 to glabrous: leaves thin, ovate-oblong to broadly lanceolate, 

 2^ inches long,loosely veined, the larger sometimes with a few 

 snfall acute teeth, the upper commonly tapering at apex into a slender or 

 cuspidate acumination: heads fully half inch high, hemispherical, either 

 racemosely disposed on slender axillary ppduncles or somewhat thyrsoid- 

 cymose : bracts of the involucre mostly acute or acuminate : some outer 

 ones loose, narrow and partly herbaceous, or with loose pointed tips; in- 

 ner ones purp ish rays about 6 lines long : style,appendageB attenuate-sub- 

 ulate : achenes obovate-oblong with narrowish summit. In the higher 

 mountains of Oregon and Washington to the Rocky mountains. 



E. serrnlatns Greene 1. c. 55. "Stoutish and rather tall, vivid green 

 and scabrous, the leaf margins even serrulate-scabrous under a lens : 

 leaves linear-lanceolate, 2 inches long, acute, marked by a very strong and 

 conspicuous white mid-vein and some reticulation of the surface : heads 

 few, large aa in the preceeding, but bracts very different, being narrow 



