Aster. COMPOSITiE. 199 



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

 Dip/opappiis albus, var. hitesci-ns, Hook. 1. c. D. li(tescens, Liiidl. in DC. 1. c. — Saskatchewan, 

 on dry limestone rocks of Red River, Doufjlas, a liroadisli-leaved scabrous-puberulent form. 

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

 small heads. 

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

 bearing a lew ratlier scattered heads : leaves not rigid nor lucid, not nervose ; cauline some- 

 what gramineous, narrowly linear and attenuate (larger 4 or 5 iuclies 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) ec^ualling the disk, of about 3 series 

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

 bristles: akenes minutely canescent. — Along mountain streams in S Arizona: Santa Rita 

 Mountains, Pringle, and Huachuca Mountains, Lemmon. 



* * Involucre rather loosely imbricated, of thin narrowly linoar-laiiceobite attenuate-acute bracts 

 in not more than 3 series : akenes glanchdar, several-nerved : stems ^eafy, a foot or two high 

 from filitbrm creepnig rootstocks, bearing several or sometimes solitary long-peduncled middle- 

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

 Northern Atlantic species. 



A. acuminatus, Micux. Somewhat pubescent or pubernlent : stem leafless below, leafy 

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

 membranaceous, 3 to 6 inches long, mostly oblong with cimeiform-attenuatc base and slender 

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

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

 or tinged purplisli : 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. divaricatus. 

 Lam. Diet. i. 305 (herb. Juss.), not L. A. diffusus, var. acuminatus, Pers. Syn. ii. 447. 

 Dlplostephium acuminatum, DC. Frodr. v. 273. — Deep and cool woods, S. Labrador to Penn- 

 svlvauia, and along the mountains to Georgia. 



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

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

 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 tlie flowering branches or peduncles linear- 

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

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

 iii. 198; Xutt. Gen. ii. 154; Torr. & Gray, 1. c. A. unifluru.% Michx. Fl. ii. 110, smaU and 

 simple-stemnjed form. A. ledifolius, Pursh, Fl. ii. 544. Galntella nemoralis, Nees, Ast. 173. 

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



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

 lanceolate dry and chartaceous (sometimes pur])lish-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. — Ettcejihrdus, Nutt. 



-I— Style-appendages subulate, equalling or longer than the stigmatic portion : invohicral 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, striatc-angled: heads showy: rays purple or violet. 

 A. Engelinanni, Gray. Commonly rather tall and robust, green, slightly pubernlent 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 ajjcx into a 

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

 mosely 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 ])ointed tips ; inner purplish : rays about half-inch long : style-appendages atten- 

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

 xxxiii. 238, without char. A. elerjans, var. Enr/rlmanni, Eaton, Bot. King Exp. 144. — Rocky 

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

 Terr. ; first coll. by II. Engelmann and Lijall. 



