AGROSTIDEiE. 295 



pyramidal or ovoid, 8-15 cm. long, the rays very slender, solitary, 

 spreading, and tlieir branches bearing few flowers at the ends of the 

 long pedicels. Spikelets purplish; empty glumes subequal or the 

 lower shorter, often ciliate at the apex and on the back, ovate, 

 1-nerved, 0.5-0.7 mm. long; floral glume oval, obscurely 3-nerved, 

 1 mm. or less in lengtli; palea as long and as wide as its glume, 

 2-nerved; floral glume and palea both thinly pubescent on tlie 

 nerves. 



Texas, Xealley for Nat. Mus. ; Colorado, John Wolfe; Arizona, 

 Pringle in 1884. 



A delicate little annual found in moist places; Colorado, New 

 Mexico, Arizona, Texas, Mexico. 



20. S. Sacatilla Griseb. Sched. Fourn. Mex. PL Enum. Gram. 

 101 (1886). 



An erect leafy and branching perennial, 20-40 cm. high, with 

 creeping rootstocks. Culms with 10-12 nodes, eacli bearing a slen- 

 der branch 12 cm. long, and each again usually branching. Leaves 

 very numerous, sheaths mostly about the length of tlie internodes; 

 ligule abruptly acute, less than 1 mm. long; blades involute, 

 spreading or recurved, 0.5-3 cm. (mostly 1 cm.) long, 0.5 diam. 

 Panicle very simple, spikelets terminal or lateral, 1-3 cm. long. 

 Spikelets 1.7-2 mm. long, oval; empty glumes subequal, about 1 

 mm. long, 1-nerved, ovate; floral glume 3-nerved; palea nearly as 

 long. Anthers 1.2 mm. long. 



Texas (Del Eio), Ne(aUy for U. S. Nat. Mus. 



Also found in Mexico. 



21 S. depauperatus (Torr.). Scribn. Bull. Torr. Club, 9:103 

 (1882). Vilfa dcpauperata Torr.; Hook. Flor. Bor. Am. 2:257 

 (1840). Vilfa utilis Torr. Pacif. E. R. Rep. 5: 365 (1853). Vilfa 

 plumhea Trin. teste Fourn. Mex. PL Enum. Gram. 101 (1886). 



A very slender and variable tufted decumbent and much- 

 branched perennial, 10-60 cm. high, often with stout rootstocks. 

 Sheaths loose, about as long as the internodes, whicli are from 4-12 

 in number, margins hyaline; ligule 0.5-3 mm. long, obtuse or 

 acute; blades scabrid above, usually involute, recurved, 1-5 cm. 

 long, about 1 mm. wide. Panicle but little exserted, slightly in- 



