Cool, mossy cliffs, Sierra de Tepixtlan near Cuernavaca, State of Morelos, alti- 

 tude 3,300 m. (7,500 feet), February 5. C. F. Pringle, No. 8018. 1899. 



AVENA STIPOIDES Scribn., sp. n. 



A very slender, erect, somewhat wiry perennial 5-6 dm. high, with linear, erect 

 leaves, and loosely few-'flowered, simple panicles 5-10 cm. long. Sheaths 

 shorter than the internodes, very minutely strigose-pubescent ; ligule 5-8 

 mm. long, hyaline; leaves involute-setaceous, at least when dry, 1-3.5 mm. 

 wide, 1-3 dm. long, scabrous. Spikelets about 13 mm. long exclusive of the 

 awn; empty glumes unequal, thin, scarious, 1-nerved, acute, the first about 

 4 mm. long, the second 5.5 mm. long, flowering glume 11 mm. long, 5-nerved, 

 slightly roughened on the nerves above, 3-toothed at the apex, teeth awn- 

 like, awned on the back below the 3-toothed apex. Awn geniculate, twisted 

 below, attached about two-thirds above the base, 13-14 mm. long. Palea 

 equaling the glume, the two nerves extending into subulate, awnlike teeth. 

 Callus hairs 1-3 mm. long. 



Sierra de San Felipe, State of Oaxaca, altitude 3,130 m. (10,300 feet), September 

 19. C. G. Pringle, No. 4905. 1894. Distributed as Mulilenhergia stipoides 

 Trin. 



This grass is closely allied to Avena micrantha, No. 8018, but is at once distin- 

 guished by its shorter empty glumes. 



The strictly one-flowered spikelets of this and the last species is a character 

 which would lead one to place these grasses in the tribe Agrostidece ; but 

 the densely hairy callus and rather rigid 5-nerved flowering glume which is 

 deeply 3-toothed at the apex, and the dorsal, geniculate, and twisted awn 

 formed by the union of three of the nerves suggest relationship with Arena 

 as does the character of the empty glumes, and I have tentatively placed 

 these species in that genus. 



POA PRATENSIS L. Sp. PI. 67. 1753. 



Mountains near Jalapa, State of Vera Cruz, altitude 1,750 m. (5,700 feet), 

 April-May. C. G. Pringle, No. 7880. 1899. 



SITANION BREVIFOLIUM J. G. S. Bui. 18, Div. Agros. 17, June 24, 

 1899. Cerro Ventoso, above Pachuca, State of Hidalgo, altitude 3,600 m. 

 (8,500 feet), August 18. C. G. Pringle, No. 6944, 1899. 



F. Lamson-Scribner, 



Agr^ostologist. 

 Approved : 



James Wilson, 



Secretary of Agriculture. 



Washington, D. C, December 19, 1899. 



i 



