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



cm. long, 1 mm. wide; panicle slen- 

 der, somewhat nodding, 10 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 hori- 

 zontally spreading, a little shorter 

 than the central one. % — Moist 

 pine woods, rare, western Florida; 

 Mississippi (McNeill). 



37. Aristida mohrii Nash. (Fig. 

 708.) 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 soli- 

 tary, appressed, distant, even the 

 upper not overlapping; glumes equal, 

 firm, rather broad toward the mu- 

 cronate apex, 1 cm. long; lemma 

 terete, a little shorter than the 

 glumes; awns divergent, the central 

 one reflexed by a semicircular bend 

 near the base, 1.5 to 2 cm. long, the 

 lateral ones scarcely shorter, than the 

 central, horizontally spreading or re- 



FlGUBE 704. 



-Aristida parishii, X 1. (Parish 1029A, 

 Calif.) 



35. Aristida virgata Trin. (Fig. 

 706.) Perennial; culms tufted from a 

 rather slender soft base, erect, 50 to 

 80 cm. tall; blades flat, rather lax, 

 usually not 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 some- 

 what reflexed, 1.5 to 2 cm. long, the 

 lateral awns erect, about two-thirds 

 as long as the central. % {A. chap- 

 maniana Nash.) — Moist sandy soil of 

 the Coastal Plain, New Jersey to 

 Florida and Texas. 



36. Aristida simpliciflora Chapm. 

 (Fig. 707.) Perennial; culms erect 

 from a rather delicate base, slender, 

 30 to 60 cm. tall; blades flat, 5 to 15 



Figure 705. — Aristida affinis, X 1. (Combs 688, Fla.) 



