Aster. COMPOSITE. 199 



Var. lutescens. Ravs pale irellow, small. — A. lutescens, Torr. & Gray, Fl. I.e. 

 DIplopappus albus, var. lutescens, Hook. 1. c. 1). lutescens, Lindl. in DC. 1. c. — S^iskatchewan, 

 on dry limestone rocks of liud Hiver, Du'c/ias, a broadisk-lea\'ed scabrous-paljeruleiit form. 

 ]Lijgl;_'\w.)(.)(l. X. Illinois, E, J. H'dl,A slender and smooth form, witk numerous and unusually 

 .Sliiiill huaiis. 

 A ■ LemiSloni. Slnider, from filiform rooLstoeks, somewhat strict, smooth and glabrous, 

 bearing a few rather scattered heads : leaves not rigid nor lucid, not uervuse ; 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, of about 3 series 

 of thin linear and acute or aciuniuate bracts : rais 2 lines long : pappus of soft and slender 

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

 Mountains, Pringle, and Huachuca Motmtaius, LdfnnHtn. 



# * Involucre rather loosely imbricated, of thin narrowly linear-]anceolate attenuate-acute bracts 

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

 from fiiilbrm creepmg root^tijcks, bearing several or sometimes solitary long-pedmicled middle- 

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

 Northern Atlantic species. 



_A. acuminatus, Micux. Somewhat pubescent or puberulent: stem leafless below, leafy 

 and somewhat corymbusely branched abo\e, or often simple, suniedujes flexuous : leaves 

 membranaceous, 3 tu G inches long, mostly oblong with cuneiform-attenuate base and slender 

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

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

 or tinged purplish : style-appendages lanceolate-subulate, slender : akenes narrow. . — 11. ii. 

 109 ; Hook. Bot. Mag. t. 2707, & Fl. ii. 9 ; Torr. & Grav, Fl. ii. 1-57, not Xees. A. divaricatus. 

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

 JJiplostephium acuminatum, DC. Prodi, a. 273. — Deep and cool woods, S. Labrador to Penn- 

 s\"lvania, and along the mountains to Georgia. 



*• A. nemoralis, Ait; .Sumewhat puberulent : stem slender, ver}' leafy above, sometimes 

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

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

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

 or sliolitly few-toothed, scabrous above ; those of the flow-ering branches or peduncles linear- 

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

 broadly linear, Uac -purple : style-appendages broadly lanceolate: akenes broader. — KeK. 

 iii. 198; Xutt. Gen. ii. 154; Torr. & Gray, 1. c. A. uniflorus, 3Iichx. Fl ii. 110, small and 

 simple-stemmed form. -1. ledifolius, Pursh, Fl. ii. 544. Galatella nemoralis, Xees, Ast. 173. 

 — Bogs and swamps, Xewfoundlaud and Hudson's Bay to Xe,w Jersey. 



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

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

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

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

 entire. Eockv Mountain and Xortliwestem species. — Euctphidus, Xutt. 



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

 all thin and drv. acute or acutish, commonly tomentose-ciUate, at least when young: aktnes 

 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 tail and robust, green, shghtly puberulent to 

 glabrous : leaves t'hin, o^■ate-.JlJlong to" broadly lanceolate (2 to 4 inches long), luu,-ely veined, 

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

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

 mosely disposed on slender axillary peduncles or somewhat thyrsoid-cyinose : involucral 

 bracts mostlv acute or acuminate ; some outer ones loo^e, narrow and partly herbaceous, or 

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

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

 xxxiii. 23S, without char. A. ele.ians. var. Engelmanni, Eaton. Bot. King Exp. 144, — Rocky 

 i\rountains, Utah and Wyoming to the Brit, boundary and in the Cascades, Washington 

 Terr. ; first coU. by H. Engdmann and Lyall. 



