99 



the lower nodes; sheaths shorter than the internodes, smooth, striate; hgule 

 hyahne, obtuse, 2 mm. long; leaf-blades linear, acuminate, 5 to 8 cm. long, 2 

 to 3 mm. wide, scabrous on both sides and on the margins. Panicle very open, 

 pale or purplish, the branches capillary, the lower ones verticillate, the upper 

 ones opposite, spreading, dichotomously or verticillately branching, somewhat 

 scabrous, the lower ones 5 to 6 cm. long; pedicels elongated, flexuous. Spike- 

 lets about 2 mm. long; empty glumes ovate-lanceolate, acute, subequal, thin, 

 slightly scabrous on the keel above; flowering glume slightly shorter than the 



empty glumes, obtuse, often 

 with 2 or 3 blunt teeth at the 

 apex; awn attached near the 

 base, equaling or slightly 

 exceeding the glume, finely 

 scabrous, straight or slightly 

 bent near the middle. Palea 

 very thin, hyaline, lanceolate, 

 obtuse, nearly three-fourths as 

 long as the flowering glume. 

 Grain lanceolate, about 1.5 

 mm. long. 

 Type specimen collected on Sierra 

 Madre Mountains, State of 

 Zacatecas, 2373 J. N. Rose, 

 August 18, 1897. 

 AgTOstis setifolia Fourn. ]Mex. 



PI. 2: 97 (1881). 

 Sierra de San Felipe, altitude 3,075 

 m. , State of Oaxaca, 922 C. L. 

 Smith, September 25, 1894. 

 AgTOstis verticillata Vill. 



Prosp. 16 (1779). 

 Durango, State of Durango, 179 

 E. Palmer, June, 1896; Nom- 

 bre de Dios, 95 E. Palmer, 

 April, 1896; Saltillo, State of 

 Coahuila, 806 E. Palmer, Sep- 

 tember, 1898, in low, wet 

 places along ditches. 

 AgTOstis virletii Fourn. Mex. 



PL 2: 96 (1881). 

 Durango, State of Durango, 190 

 E. Palmer, June, 1896, very 

 abundant in low, wet places 

 in alkali bottoms. 

 *Avena micrantha Scribn. V . S. 

 Dept. Agr. Div. Agros. Cir. 19: 3, pj. 1 (January 1, 1900). (Fig. 6.) 

 A very slender, densely csespitose, upright perennial, 2.5 to 3.5 dm. high, with soft 

 leaves 6 to 15 cm. long, 1 to 2 mm. wide, ligules 5 to 6 mm. long, and loosely 

 flowered simple panicles 5 to 7 cm. long. Sheaths glabrous; leaves pubescent 

 above, smooth beneath, becoming involute when dry; branches of the panicle 

 capillary, spreading or ascending, 1 to 3 flowered, the longer lower branches 1 to 

 3 cm. long; empty glumes miequal, lanceolate, the first about 8 mm. long, 1 -nerved, 

 the second about as long as the flowering glume, 3-nerved near the l)ase, thin- 

 membranous and abruptly pointed; flowering glumes glabrous, 5-nerved, rounded 



Fig. 5. — AgroMU rosri Scrib. & Morrill: a, a spikelet; b, the 

 awned flowering glume and palea; c, the grain. 



