200 POACE^. 



spotted, scabrid, about 9 mm. long, including the short twisted 

 beak; lateral awns diverging, 10 mm. long, the central one a little 

 longer. 



West Texas, Nealley 514 in 1889. 



Abundant on rocky soil. 



10. A. simplicifolia Chapm. Coult. Bot. Gaz. 3: 18 (1878). 

 Culms erect, filiform, sparingly branched, 50-80 cm. high. 



Blades of sterile shoots G-12 cm. long, those of the culm 3-3 in 

 number, involute, 10-30 cm. long. 1-3 mm. wide. Raceme much 

 exserted, simple, straight, 15-25 cm. long; spikelets mostly single 

 on short pedicels; empty glumes nearly equal, 1-nerved, extending 

 a little above the base of the awns, 10 mm. long. The awns widely 

 spreading, nearly equal, a little longer than the empty glumes, all 

 curved in a semicircle at the base when dry. Chajiman says: 

 "The lateral one straiglit, the middle one curving." 



Alabama (Mobile), Mohr. 



Alabama and Florida. 



11. A. gyrans Chapm. Coult. Bot. Gaz. 3: 18 (1878). 



A slender glabrous strict purplish grass, 30-45 cm. high. 

 Culms with about three nodes. Sheaths two-thirds as long as the 

 internodes; ligule very short; blades involute-filiform, shorter than 

 the culm. Panicle simple, strict, narrow, 12-15 em. long; rays 

 mostly single, the longest 2.5 cm. long, bearing 2-3 spikelets. 

 Empty glumes very unequal, short-awned, first as long as the floret, 

 7 mm. long, including the point 10-11 cm. long; awns nearly 

 equal, slender, loosely twisted at the base, diverging, 12-15 mm. 

 long. 



U. S. Dept. Agricul., Chapman. 



South Florida (Robert's Key). 



13. A. basiramea Vasey, Coult. Bot. Gaz. 9:76 (1884). 



An erect slcjuler annual, 20-70 cm. high, much branched, 

 bearing flowers from very near the roots to the apex of the culm; 

 nodes tumid; internodes naked, as the branches crowd the sheaths 

 away. Ligule very short; blades becoming involute, 8-18 cm, long, 

 setaceous above, sparingly hairy on the margins below. Panicles 

 erect, loose, simple, the lateral ones sheathed by the leaves, the lat- 



