t"IIlA)l{ll>K.K. 421 



est; paloa with "i setas 3-lobeil, us long as its glume, the midtUo 

 lobe I'liiargiiuite. 



Mexico. Ptihiier 1(U5; also fouiul in Arizona. 



11. B. eriopoda Ton-. I'aeif. Kail. Kep. 4: Hot. 155 (185;). 



Culms tufted, white woolly below, MO-30 cm. high. Leaf- 

 blailts very narrow, involute. \-\ cm. long. Spikelcts ;>-(;. rather 

 loose and slender, oval or narrowly elliptical, 1. 5-^*. 5 cm. long, on 

 short hairy i)edieels. First empty glume oblong, mucronute, about 

 "i mm. long, with the single nerve towards one siile, sccoiul glume 

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

 scure nerve toward the ajjcx on each side the miildlc; iloret hairy 

 at the base. Iloral glume lance-ovate, 5 mm. long, central seta 1-'^ 

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

 ghnne, nerves weak or obscure at the apex; rachilla slender, 'i. mm. 

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

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



New Mexico, Wriijltt 748, "ZO\.S\ Arizoiui, Loumon 305; 

 Mexico. I*n'tti/h' 411. 



Texas. New Mexico, Arizona, and Mexico. 



Hunched on dry rocky or gravelly nu'sas and foot-hills; the wiry 

 culms more or less elongated and trailing; (puility ami value equal 

 to J), hirsiitit. 



13. B. trifidaThurb. Ciram. Mex. Hound. Surv. iued. S. Wats. 

 Troc. Anu-r. Acad. 18: i:r (188:5). 



A densely ca'spitose glaucous perennial, 5-18 cm. liigh. Hlades 

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

 loose, nearly straight, \-l cm. long. Mmply ghuues lanceolate, 

 mucronate. scarious, 3-awm'd, first 4 mm. long, secoiul a little 

 longer; iloral ghnne scarious or nearly snu)olh, '^ mm. long, the 

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

 stouter and longer; palea rather iirm, ecpialling its glume; rachilla 

 smooth, 1 nnn. long, bearing 3 nearly equal seta*, slightly dilated 

 below, about (5 mm. long. 



Texas, liererrhon 1408. Xrttllei/ for Nat. Mus. ; Xew Mexico, 

 iVn'yhf 4G. 22(i, T49, 2(V.H); Arizona, Priiiijle; Mexico, rarri/ 413, 

 945, Primjh', Pahiivr 1:555. 



