424 POACE^. 



characters uniform witliin narrow limits in all the specimens ex- 

 amined from the United States, Mexico, Panama, and the West 

 Indies. There can be little hesitation in referring all the follow- 

 ing to Lagasca's species, viz., Heterosteca juncifolia H. B. K., Nov. 

 Gen. 1:173, t. 54. Dinehra refens H. B. K., 1. c, 172, t. 52. 

 Bouteloua Humholdtiana Griseb. Probably also Dinehra hromoides 

 H. B. K., 1. c, t. 51." 



Texas, Nealley for Nat. Mus. ; Mexico, Scliaffner 1001, 1003, 

 Talmer, 115% 188, 201, 1354, Pringle 1436. 



Western Texas, Arizona, Mexico, Central America. 



16. B. Havardi Vasey, S. Wats, in Proc. Am. Acad. 18 : 179 

 (1883). 



An erect tufted perennial, 20-40 cm. high. Ligule a ciliate 

 ring; blades numerous below, flat, firm, 7-15 cm. long (the upper 

 2-3 cm.), 2 mm. wide, sparingly silky hairy. Spikes 4-6, white, 

 silky, villous, about 1 cm. long, on a slender axis 4-5 cm. long. 

 Spikelets 7-10 to each spike, crowded, first glume hyaline, lance- 

 olate, 2.5 mm. long, including a short seta, second ovate-lance- 

 olate, 3.5 mm. long besides a seta 2 mm. long, the nerve very 

 heavy; floral glume hairy, broadly oval, 5 mm. long, 1.7 mm. wide, 

 the lobes about equal; palea a little shorter, 2-toothed; rachilla and 

 the 3 setae very slender and weak, 3-G mm. long, the middle one 

 with membranous margins or none. 



Texas, Havard, Nealley; New Mexico, Wright 753; Arizona, 

 Pringle ; Mexico, Pringle 410. 



Texas, New Mexico, Arizona, Mexico. 



Mr. Pringle says: " This I have found to be the most valuable 

 pasture-grass of tlie hills and mesas around the city of Chihuahua. 

 Being perennial it forms a sod, more or less interrupted however. Its 

 leaves are mostly radical, and are abundant, its culms slender and 

 about a foot in height; to the tender and nutritious quality of its 

 herbage the animals, which kept it closely croj^ped down through- 

 out most of the season, gave abundant testimony.'' 



17. B. Allamosana Yasey, Contrib. U. S. Nat. Herb. 1:115 

 (1891). 



Tufted, diffuse, 7-15 cm. high. Leaves with pubescence from 



