191 1-] TRELEASE— THE DESERT GROUP XOLIXE.E:. 433 



brush-tipped, whitened, minutely roughened and 

 dull : prickles about 5 mm. apart, 2 mm. long, yellow, 

 becoming red upwards, the margin very rough be- 

 tween them. Inflorescence moderate, exceptionally 

 sub-simple. Perianth segments scarcely 2 mm. long. 

 Fruit elliptical or somewhat obovate, 4X6 mm., the style scarcely 

 equaling the narrow moderately deep notch. Seed? 



East-central ^Mexico. In the region of D. graminifolinin and 

 NoHna hiiiiiilis and U'atso)ii. 



Specimens examined : Sax Luis Potosi. Mcinity of San Luis 

 Potosi (Parry & Palmer, 8/6, 1878, — the type; Schaffncr, 242, 

 1878, — ^mixed with D. graminifoUum? ). 

 Prickles prevailingly recurved. 



D. leiophyllum Engelmann in herb. 



Dasylirioii sp. Trelease, Pop. Sci. Monthly. 70 : 220. /. 14. 



Shortly caulescent. Leaves becoming 15-20 mm. wide, scarcely 

 I m. long, somewhat brush-tipped, green or at first somewhat 

 glaucous, smooth, rather glossy : prickles usually 

 10-15 mm. apart, 3-4 mm. long, yellow, usually be- 

 coming orange or red at least above the middle, the 

 margin sometimes smooth between them. Inflores- 

 cence rather high. Perianth segments scarcely 2 mm. long. Fruit 

 obovately subelliptical, 4-5 X 6-8 mm., the thick style about equaling 

 the moderately open and deep notch or exserted if the wings have 

 not fully developed. Seed 2X3 mm. — PI. 12. 



Southern Texas, in the Rio Grande region, passing into New 

 ^lexico and reaching or reappearing in central Chihuahua. — Ad- 

 joining or overlapping the range of D. IVhcelcri JVisli::c)u and 

 A^oUna crumpcns and affinis. 



Specimens examined: Texas. Presidio (Haz'ard, i8?o. — the 

 type). Eagle Pass (':Havard. 1883). Sierra Blanca (Trdcasc. 

 1892. ^88, 1900; Midford, 2jj. 1895; Rose, Standlcy & Russell. 

 12222, 1910). Van Horn (Eggcrt, 1900). Xew^ Mexico. Cen- 

 tral {Midford, 424. 1895). Florida ^Mountains {Mulford, 10^/, 

 1895). Chihuahua. Sta. Eulalia ^Its. {Pringk, 14Q, 1885; 

 JJHlia))isou, 1885). 



PROC. AMER. PHIL. SOC , L. 200 BE, PRINTED AUG. 7, I9II. 



