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



10. Leptochloa scabra Nees. (Fig. 1022.) Annual; culms erect, 

 about 1 m tall, somewhat robust and succulent, sparingly branching; 

 sheaths and blades scabrous, the blades elongate, 8 to 12 mm wide; 



panicle 20 to 40 cm long, not more than 7 cm 

 wide, usually less, the slender racemes crowded, 

 4 to 8 cm long, ascending or somewhat droop- 

 ing, usually curved or flexuous; spikelets 

 crowded, mostly 3-flowered, about 3 mm long; 

 lemmas acute, awnless, 

 the nerves pubescent. 

 O — Marshes and 

 ditches, Louisiana (near 

 New Orleans) and trop- 

 ical America. 



11. Leptochloa pasii- 

 coides (Presl) Hitchc. 

 (Fig. 1023.) Annual; 



culms erect or spreading, 50 to 100 cm tall, 

 branching; sheaths glabrous; blades thin, 5 to 

 10 mm wide, scaberulous; panicle oblong, 10 

 to 20 cm long, 3 to 5 cm wide, the racemes 

 approximate, 3 to 5 cm long, ascending, rather 

 lax; spikelets 5- to 7-flowered, 4 to 5 mm long; lemmas 2.5 mm long, 

 apiculate, the lateral nerves minutely pubescent at base. O {L. 

 Horibunda Doell.) — Indiana (Posey County), Mississippi (Holmes 

 County), Louisiana, Texas; Brazil (fig. 1024). 



Figure 1020.— Distribution of 

 Leptochloa uninervia. 



Figure 1019.— Leptochloa uni- 

 nervia. Panicle, X 1; two views 

 of floret, X 10. (Tharp 3123, 

 Tex.) 



Figure 1021. — Leptochloa neal- 

 leyi. Panicle, X 1; two views 

 of floret, X 10. (Fisher 25, 

 Tex.) 



Figure 1022.— Leptochloa scabra. Panicle, X 1; 

 two views of floret, X 10. (Tracy 8388, La.) 



91. TRICHONETJRA Anderss. 



Spikelets few-flowered, the rachilla disarticulating above the glumes, 

 the internodes pilose at base, disarticulating near their summit, the 

 upper part forming a short callus below the floret; glumes about 



