Aster. COMPOSITE. 199 



Var. lutescens. Rays pale yellow, small. A. lutescens, Torr. & Gray, PI. I.e. 

 Diplopappus albua, vur. lutescens, Hook. 1. c. D. lutescens, Lindl. in DC. 1. c. Saskatchewan, 

 011 dry limestone rocks of Red River, Dotujlux, a broad ish-leaved scabrous-puberulent form. 

 Englewood, N. Illinois, E. J. Hill, a, slender ;uid smooth form, with numerous and unusually 

 small heads. 



A. Lemmoni. Slender, from filiform rootstocks, somewhat strict, smooth and glabrous, 

 bearing a few rather scattered heads: leaves not rigid iior lucid, not nervo.se ; cauline some- 

 what gramineous, narrowly linear and attenuate (larger 4 or 5 inches long, a line or two 

 wide), on flowering branches gradually reduced to subulate-attenuate; radical shorter, lan- 

 ceolate-oblong or spatulate: involucre (3 lines high) equalling the disk, < if about 3 series 

 of thin linear and acute or acuminate bracts : rays 2 lines long : pappus of soft and slender 

 bristles: akeiies minutely canesceut. Along mountain streams in S Arizona: Santa Rita 

 Mountains, Print//?, and lluachuca Mountains, Lvtiimon. 



* * Involucre rather loosely imbricated, of thin narrowly linear-lanceolate attenuate-acute bracts 

 in not more than 3 series: akenes glandular, several-nerved: steins leafy, a foot or two high 

 from filiform creeping rootstocks, bearing several or sometimes solitary loug-peduncled middle- 

 sized heads : leaves mostly pimiately veined, thin or thiimish, from lanceolate to oblong-ovate. 

 Northern Atlantic species. 



A. acuminatus, MICIIX. Somewhat pubescent or puberulent: stem leafless below, leafy 

 and somewhat corymbosely branched above, or often simple, sometimes flexuous : leaves 

 membranaceous, 3 to 6 inches long, mostly oblong with cuneiform-attenuate base and slender 

 acuminate apex, sharply and coarsely dentate, primary veins abundant and conspicuous: 

 heads usually several and corymbiform-paniculate, barely half-inch high : rays linear, white, 

 or tinged purplish: style-appendages lanceolate-subulate, slender : akenes narrow. Fl. ii. 

 109 ; Hook. Bot. Mag. t. 2707, & Fl. ii. 9 ; Torr. & Gray, Fl. ii. 157, not Xees. A. divan&iti:*, 

 Lam. Diet. i. 305 (herb. Juss.), not L. A. d/Jfusus, var. acumhitttus, Pers. Syn. ii. 447. 

 Jitji/ostephiitiit fifiniiiiKitiim, DC. Prodr. v. 273. Deep and cool woods, S. Labrador to Penn- 

 sylvania, and along the mountains to Georgia. 



A. nemoralis, Ait. Somewhat puberulent : stem slender, very leafy above, sometimes 

 simple and bearing a single slender-pedunculate head, often corymbosely or somewhat umbel- 

 lately branched above, the branches similarly monocephalous : leaves from oblong-lanceolate 

 to broadly linear, an inch or two long, acutish or obtuse, tipped with a callous point, entire 

 or slightly few-toothed, scabrous above; those of the flowering branches or peduncles linear- 

 subulate and scattered: involucre of more numerous linear-subulate puberulent bracts: rays 

 broadly linear, lilac -purple : style-appendages broadly lanceolate : akeiies broader. Kew. 

 iii. 198; Nutt. Gen. ii. 154; Torr. & Gray, 1. c. A. nniflorus, Michx. Fl. ii. 110, small and 

 simple-stemmed form. A. ledifolius, Pursh, Fl. ii. 544. Galatella i/< inanilis, Nees, Ast. 173. 

 Bogs and swamps, Newfoundland and Hudson's Bay to New Jersey. 



* * * Involucre closely and regularly appressed-imbricatecl in several series of ovate or ovate- 

 lanceolate dry and chartaceous (sometimes purplish-tinged) bracts : akenes oblong, compressed, 

 more or less pubescent: stems leafy to the top, bearing several or rarely solitary pedunculate 

 heads : leaves mostly pinnately veined, sessile, from lanceolate to oblong-ovate, commonly 

 entire. Rocky Mountain and Northwestern species. Eucephahts, Nutt. 



-I Style-appendages subulate, equalling or longer than the stigmatic portion: involucral bracts 

 all thin and dry, acute or acutish, commonly tomentose-ciliate, at least when young: akenes 

 rather broad and flat, hirsute, becoming glabrate at maturity: stems mostly simple and 2 or 3 

 feet high, striate-angled: heads showy: rays purple or violet. 



A. Engelmanni, GRAY. Commonly rather tall and robust, green, slightly puberulent to 

 glabrous : leaves thin, ovate-oblong to broadly lanceolate (2 to 4 inches long), loosely veined, 

 the larger sometimes with a few small acute teeth, upper commonly tapering at apex into a 

 slender or cuspidate acumination : heads (fully half-inch high), hemispherical, either race- 

 inosely disposed on slender axillary peduncles or somewhat thyrsoid-cymose : involucral 

 bracts mostly acute or acuminate ; some outer ones loose, narrow and partly herbaceous, or 

 with loose pointed tips ; inner purplish : rays about half-inch long : style-appendages atten- 

 uate-subulate : akeues obovate-oblong with narrowish summit. Am. Jour. Sci. ser. 2, 

 xxxiii. 238, without char. A. elegans, var. Engelmanni, Eaton, Bot. King Exp. 144. Rocky 

 Mountains, Utah and Wyoming to the Brit, boundary and in the Cascades, Washington 

 Terr. ; first coll. by H. Engelmann and Li/all. 



