200 POAi'K.K. 



Hpottcd, rtcubrid. ultoiit '.» iiiiu. loiij;, iiicludiiijr tlio sliort twisttMl 

 li<>ul\: liitcml awtiri divurgin^, 10 iiiiii. luii*;;. the ccMitnil oue ti little 

 lon^'cr. 



West Texas, XcaUvij 514 in IH.SO. 



Ahundunt on rocky soil. 



10. A. simplioifolia Clui(in). Coult. Hot. (ia;;. :): IH (1878). 

 Culms erect, lilit'orni. .^^parin^'ly lirain-lied, TjU-HO cm. Iiij,di. 



Hlatles of sterile shoots (J-l*^ cm. lon<;, those of the culm 2-;5 in 

 number, involute, 10-20 em. lonjj;. 1-;.' mm. wide. Uaceme much 

 exscrted, simple, straijjht, 15-25 cm. lon^s spikelets mostly sinjilo 

 on short jiedicels; empty <;himes lu-arly e<|ual, 1 -nerved, extending' 

 a little above tiu' base of tiie awns. 10 mm. lonj;. The awns widely 

 8|)rea<lin^', nearly e(|ual, a little lon<,'er ihan the »'mp*y <.'lumes, all 

 curved in a semicircle at the l»ase when dry. Chapnum says: 

 "Tile lateral one strai<i;ht, the midille one curving." 



Alabama (M<»bilc), Malir. 



Alabanui and Florida. 



11. A. gyrans Chajun. Coult. Bot. Ciaz. :'): IS (18:8). 



A slender glabrous strict ))urplish grass, ;»0-4r> cm. high. 

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

 iuternodes; ligule very short; blades involute-lilirorm, .shorti-r tliaii 

 the culm. I'anicle simple, strict, narrow, 12-I.'> cm. long; rays 

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

 Em|>ty glumes very une((ual, short-awned. first as long as the floret, 

 7 mm. long, including the i)oint 10-11 cm. long; awns nearly 

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

 long. 



IT. S. Dept. Agricul.. Cliapman. 



South Florida (Robert's Key). 



12. A. basiramea Vasey, Coult, Hot. Gaz. 0:70 (1884). 



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

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

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

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

 setaceous above, sparingly hairy on the nnirgins below. Paiucles 

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



