CHLORIDES. 421 



est; palea witli 2 seta^, 3-lobcd, as long as its glume, the middle 

 lobe emarginate. 



Mexico, Palmer ICG ; also found in Arizona. 



11. B. eriopoda Torr. Pacif. Rail. Rep. 4: Bot. 155 (1857). 



Culms tui'ted, white woolly below, 30-30 cm. high. Leaf- 

 blades very narrow, involute, 1-4 cm. long. Spikelets 3-6, rather 

 loose and slender, oval or narrowly elliptical, 1.5-2.5 cm. long, on 

 short hairy pedicels. First empty glume oblong, mucronate, about 



2 mm. long, with the single nerve towards one side, second glume 

 4.5 mm. long, lance-elliptical, acute, without a cusp, with an ob- 

 scure nerve toward the apex on each side the middle ; floret hairy 

 at the base, floral glume lance-ovate, 5 mm. long, central seta 1-2 

 mm. long, lateral setae obscure or absent; palea about equal to its 

 glume, nerves weak or obscure at the apex; rachilla slender, 2 mm. 

 long, hairy near the apex, bearing 3 bristles 4-5 mm. long, the mid- 

 dle one at the base twice as wide as the lateral ones. 



New Mexico, Wright 748, 2018; Arizona, Lemmon 395; 

 Mexico, Pringle 411. 



Texas, New Mexico, Arizona, and Mexico. 



Bunched on dry rocky or gravelly mesas and foot-hills ; the wiry 

 culms more or less elongated and trailing; quality and value equal 

 to B. hirsiita. 



12. B. trifida Thurb. Gram. Mex. Bound. Surv. ined. S. Wats. 

 Proc. Amer. Acad. 18:177 (1883). 



A densely c^espitose glaucous perennial, 5-18 cm. high. Blades 



3 cm. long, 1 mm. wide. Spikes 3-5, slender, smooth, rather 

 loose, nearly straight, 1-2 cm. long. Empty glumes lanceolate, 

 mucronate, scarious, 3-awned, first 4 mm. long, second a little 

 longer; floral glume scarious or nearly smooth, 2 mm. long, the 

 nerves obscure, lateral awns about mm. long, the central a little 

 stouter and longer; palea rather firm, equalling its glume; rachilla 

 smooth, 1 mm. long, bearing 3 nearly equal setre, slightly dilated 

 below, about 6 mm. long. 



Texas, Reverclion 1408, Nealley for Nat. Mus. ; New Mexico, 

 WrigU 46, 226, 749, 2020; Arizona, Pringle; Mexico, Parry 412, 

 945, Pringle, Palmer 1355. 



