FESTUCE^. 471 



spicuous light-colored mid-nerve aud a similar one on each margin, 

 the width of leaf nearly uniform throughout. Panicle much ex- 

 serted, dense, linear or ovoid, slightly interrupted below, 4-5 cm. 

 long. Spikelets whitish, tinged more or less with purple, oblong, 

 G-7-flowered, 7 mm. long; empty glumes oval- lanceolate, 1-nerved, 

 first 4-4.5 mm., second 5-6 mm. long; floral glume with keel pu- 

 bescent toward the base, aud lateral nerves throughout, ovate-oval, 

 obtuse, 4 mm. long, the awn projecting none or but little above the 

 lobed apex of its glume; palea falcate, sjiatulate, ciliate on the 

 nerves, 2.5 mm. long. Nearly allied to S. grandiflora. 



Texas, Nealley for ISTat. Mus., Chenate Mountains, Presidio 

 county. 



15. S. grandiflora (Yasey). Triodia grandiflora Vasey, Con- 

 trib. U. S. Nat. Herb. 1:59 (1890). 



A slender erect or geniculate tufted glaucous grass, 20-50 cm. 

 high ; nodes villous. Leaves of sterile shoots numerous, recurved, 

 conduplicate, 5-8 cm. long, 2.5 mm. wide, apex obtuse, those of 

 the culm 3; ligule a brown ciliate callous ring; all blades with a 

 conspicuous light-colored mid-nerve and a similar one on each mar- 

 gin, the width of blade nearly uniform throughout. Panicle much 

 exserted, dense, linear or ovoid, 4-6 cm. long. Spikelets whitish, 

 tinged more or less with purple, linear to oval, 4-6-flowered, 8-10 

 mm. long; empty glumes lanceolate, 1-nerved, first 5-6 mm, long, 

 second 7-8 mm. long; floral glume with keel pubescent toward the 

 base and lateral nerves throughout, ovate-lanceolate, obtuse, 5-6 

 mm. long, the awn 0.5 to 1 mm. long; palea falcate-si^atulate, cili- 

 ate on the nerves, nearly 4 mm. long. 



Texas, Nealley for Nat. Mus. ; Mexico, Pringle 406. The latter 

 was distributed as T. avenacea H. K., by which name this grass has 

 been known for some years. Dr. Vasey, after comparing the draw- 

 ings of T. avenacea with the above plant, decided that the grasses 

 are identical, hence the new name. 



Texas to Arizona and Mexico. 



16. S. mutica (Torr.) Kuntze, 1. c. Triciispis mutica Torr. 

 Pac. R. R. Rep. 4:156 (1857). 



A slender erect or rigid glaucous tufted grass, 40-70 cm. 



