OF ARTS AND SCIENCES. 



139 



about 1^ lines long, somewhat longer than the delicate pappus. — In 

 shallow water at Del Rio, State of Mexico ; August, 181)0 (u. 3236). 



Acii^ETOGEHON LiNEARiFOLius. Biennial or perennial (?), branch- 

 ing from the base, the stems ascending or decumbent, a foot high or 

 less, somewhat strigose-pubescent: leaves numerous, dark green, nar- 

 rowly linear, entire or rarely with one or two narrow lateral lobes, 

 mostly 1 to 1^ inches long, acute, narrowed to the base: heads hemi- 

 spherical (4 or 5 lines in diameter), with hemispherical receptacle and 

 linear acuminate involucral bracts: rays very numerous in several 

 rows: acheues (immature) compressed (?), sparsely hispidulous ; pap- 

 pus coroniform, dentate and laciniately denticulate, nearly as long as 

 the proper tube of the corolla. — BlutTs and plains near Flor de Maria, 

 State of Mexico ; Sept., 1890 (n. 3242). The distinctions between the 

 genera Aphanostephus and Acltcetogeron are very vaguely defined, 

 the latter genus appearing to rest upon the compressed Erigeron-like 

 acheues. 



PsiLACTis TENUIS. Erect, sleudcr (2 feet high), branching above, 

 the slender spreading branches simple or few-flowered, rough-hispid 

 with spreading hairs : cauliue leaves oblong-oblanceolate, acute, nar- 

 rowed to a short winged petiole, sharply serrate, 1 to 1^ inches long, 

 those on the branches gradually smaller and narrower: heads solitary 

 and terminal, small (2 lines high) ; involucral scales thin and scarcely 

 herbaceous, narrowly linear, acuminate : ligules purplish, 3 lines long: 

 acheues sparsely pubescent ; pappus of disk-achencs of numerous 

 (about 30) barbellate setae. — In the Sierra Madre near Monterey; 

 June, 1888 (n. 2238). 



Aster Carnerosanus. Stems a foot high or less, from slender 

 rootstocks, slender, purplish, pubescent: leaves oblanceolate, 1^ inches 

 long or less, mostly entire, glabrous or nearly so, shortly ciliate, the 

 bracteal oblong, 2 or 3 lines long : heads middle-sized (5 lines high), 

 solitary on the short branches, the numerous foliaceous-tipped scales 

 somewhat spreading, oblanceolate, acute or the innermost subacumi- 

 nate : rays pale purple. — At Carneros Pass in the mountains of Coa- 

 huila ; Sept., 1889 (n. 2859). Rather closely resembling A. surculosics 

 of the Alleghanies, but with smaller heads. 



Melampodium glabrum. Nearly glabrous (slightly scabrous 

 above, especially on the peduncles), decumbent, branching : leaves 

 oblong- to linear-lanceolate, scarcely narrowed to the broad clasping 

 base, acutish, sparingly toothed, 1| inches long or less: heads small 

 (2 to 2^ lines high), on slender peduncles, the 5 or 6 ovate scales 

 obtuse or acutish ; ligules oblong, shorter than the scales, yellow : 



