AGROSTIDE^. 1268 



Arizona, C S. Dept. Agrirnl. 322 from Jones. 

 Nebraska. Colorado, Xew Mexico, Arizona, Utali. Known in 

 Arizona as l'>J((ck (lama or Gama C/n'na. 



48. M. tenella (II. B. K.) Trin. Unifl. 193 (1834). Podosw- 

 muni teneUum II. B. K. Nov. Gen. et. Sp. 1:128 (1815). 

 Trichochloa tenella R. & S. Syst. 2:38.5 (1817). 



A slender light reddish-green, much-branched and diffuse an- 

 nual, 15-20 cm. high. Sheaths frequently crowded from, and but 

 little longer than, the internodes; ligulea ciliate ring; blades thin, 

 flat or involute, often pubescent, 2-6 cm. long, 1-1.5 mm. wide. 

 Panicles lateral and terminal, slendei", interrupted, spikelike, 8-12 

 cm. long; rays single or in twM:)s, the longest 1 cm. long. Spikelets 

 sessile or on pedicels 1-2 mm. long; emj^ty glumes 1-nerved, sub- 

 equal, 1.5-2 mm. long, including the bristle-point or awn; floral 

 glume lanceolate, 3-nervecl, about 3.7 mm. when spread, appearing 

 shorter, gradually tapering to the awn, which is 1.5 cm. long; palea 

 very narrow, as long as its glume. Grain lanceolate, 2.6 mm. long. 



Mexico, Palmer 481, Pringle 175, 1745. 



49. M. strictior (Scribn.). M. flavidawAv. strictior ^cvWin. ined. 

 A soft annual, much branched from near the base, 20-30 cm. 



high. Sheaths shorter than the internodes; ligule acute, 3 mm. 

 long; blades scabrous, involute or flat, 2-5 cm. long, 1-2 mm. 

 wide. Panicle linear, erect, yellowish or reddish green, 4-8 cm. 

 long, rays single or clustered, sparingly branching, bearing 10-15 

 spikelets along the entire length. Spikelets on pedicels mostly 

 about 1 mm. long; empty glumes equal, thin, linear-lanceolate, 1- 

 nerved, 2.5-2.8 mm. long; floral glume almost hyaline, lanceo- 

 late, pubescent on the margins, 2-toothed, 3.5-3.8 mm. long, the 

 awn 1.5-2 mm. long; palea 2-toothed, as long as its glume. An- 

 thers linear, 0.8 mm. long. 

 Mexico, Pringle 1418. 



50. M. Arizonica Scribn. Bull. Torr. Club, 15: 8 (1888). 



A densely tufted perennial; culms slender, erect, 15-35 cm. 

 high. Ligule thin, 1.5-2 mm. long; blades scabrid on the mar- 

 gins and keel, flat or conduplicate. 3-5 cm. long, 1-1.5 mm. wide, 

 pungent-pointed. Panicle purple, thin, ovoid, 8-18 cm. long, rays 



