458 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



more than 2 mm wide; panicle slender, erect, though not very stiff, 

 rather loosely flowered, one- third to half the entire length of the culm; 

 glumes about equal, 6 to 7 mm long; lemma 4 to 5 mm long; central 

 awn horizontally spreading or somewhat reflexed, 1.5 to 2 cm long, 

 the lateral awns erect, about two-thirds as long as the central. Ql 

 (A chapmaniana Nash.) — Moist sandy soil of the Coastal Plain, New 

 Jersey to Florida and Texas (fig. 992). 



36. Aristida simpliciflora Chapm. (Fig. 993.) Perennial; culms 

 erect from a rather delicate base, slender, 30 to 60 cm tall; blades flat, 

 5 to 15 cm long, 1 mm wide; panicle slender, somewhat nodding, 10 



Figure 985.— Aristida rhizomophora. Plant, X H', spikelet, X 2; two views of callus, X 10. (Type.) 



to 20 cm long, few-flowered, the spikelets mostly in pairs; glumes 

 equal, 6 to 7 mm long; lemma a little shorter than the glumes; central 

 awn finally reflexed by a semicircular bend, 1 to 1.5 cm long, the 

 lateral awns horizontally spreading, a little shorter than the central 

 one. % — Moist pine woods, rare, western Florida; Mississippi 

 (McNeill). 



37. Aristida mohrii Nash. (Fig. 994.) Perennial; culms erect, 

 40 to 60 cm tall; blades flat or those of the innovations involute, 10 to 

 15 cm long, 1 to 2 mm wide, the uppermost reduced; panicle slender, 

 strict, as much as 30 cm long; spikelets solitary, appressed, distant, 



