

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



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 drooping, usually curved 

 or flexuous ; spikelets crowded, mostly 

 3-flowered, about 3 mm. long; lemmas 

 acute, awnless, the nerves pubescent. 

 O — Marshes and ditches, Louisi- 

 ana (near New Orleans) and tropical 

 America. 



11. Leptochloa panicoides (Presl) 

 Hitchc. (Fig. 731.) Annual; culms 

 erect or spreading, 50 to 100 cm. tall, 

 branching; sheaths glabrous; blades 



Figure 726. — Leptochloa viscida. Panicle, X 1; floret, 

 X 10. (Mearns 833, Ariz.) 



to 50 cm. long, not more than 4 cm. 

 wide, the racemes subverticillate, 

 overlapping, 2 to 4 cm. long, 

 appressed or ascending; spikelets 

 crowded, 3- or 4-flowered, 2 to 3 mm. 

 long; lemmas about 1.5 mm. long, ob- 

 tuse, the nerves sparingly pubescent, 

 the lateral close to the margin. O 

 — Marshes, mostly near the coast, 

 Louisiana (Cameron) and Texas; also 

 eastern Mexico. 



10. Leptochloa scabra Nees. (Fig. 

 730.) Annual; culms erect, about 1 m. 

 tall, somewhat robust and succulent, 









■1 : lil lb 





f 



Figure 727. — Leptochloa fascicularis. Panicle, X 1; 

 two views of floret, X 10. (Hitchcock 7876, Md.) 



Figure 728. — Leptochloa uninervia. Panicle, X 1; two 

 views of floret, X 10. (Tharp 3123, Tex.) 



thin, 5 to 10 mm. wide, scaberulous; 

 panicle oblong, 10 to 20 cm. long, 3 

 to 5 cm. wide, the racemes approxi- 

 mate, 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. 

 floribunda Doell. ) — Indiana (Posey 

 County) and Missouri to Mississippi 

 (Holmes County), Arkansas, and 

 Texas; Brazil. 



98. TRICHONEURA Anderss. 



Spikelets few-flowered, the rachilla 

 disarticulating above the glumes, the 

 internodes pilose at base, disarticulat- 

 ing near their summit, the upper part 



