MANUAL OF THE GRASSES OF THE UNITED STATES 



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long, usually ascending or appressed, or at maturity spreading; spike- 

 lets usually overlapping, 7 to 12 mm long, 6- to 12-flowered; lemmas 

 4 to 5 mm long, the lateral nerves pubescent below, acuminate, the 

 awn from short to as long as the body. O (Diplachne jascicularis 

 Beauv.)— Brackish marshes along the coast, New Hampshire to 

 Florida and Texas and in alkali flats, ditches, and 

 marshes, Illinois and South Dakota to Texas, west 

 through Colorado and New Mexico to California; 

 also Washington (Bingen) and Oregon ; south through 

 tropical America to Argentina (fig. 1018.) A pros- 

 trate form has been called Dip- 

 lachne procumbens (Muhl.) 

 Nash and D. maritima Bickn. 

 8. Leptochloa uninervia 

 (Presl) Hitchc. and Chase. 

 (Fig. 1019.) Resembling L. 

 jascicularis, rather sparingly 

 branching, usually strictly 

 erect, the panicle more oblong 

 in outline, with shorter, denser-flowered racemes; 

 spikelets 5 to 7 mm long, 6- to 9-flowered, lead-color; 

 glumes broader, more obtuse ; lemmas scarcely nar- 

 rowed toward tip, apiculate but not awned, the lat- 

 eral nerves more or less excurrent. © (L. imbricata 

 Thurb.) — Ditches and moist places, Mississippi to 

 Colorado and southern California, south to Mexico ; 

 Peru to Argentina; introduced from Maine to New Jersey (fig. 

 1020). 



9. Leptochloa nealleyi Vasey. (Fig. 1021.) Annual, usually erect 

 and rather robust; culms mostly 1 to 1.5 m tall, simple or sparingly 



branching at base; sheaths gla- 

 brous or slightly scabrous, mostly 

 keeled; blades elongate, flat to 

 loosely involute; panicle commonly 



Figure 1015.— Distribution of 

 Leptochloa filiformis. 



Figure 



Lepto- 



chloa viscida. Panicle, X 

 1; floret, X 10. (Mearns 

 833, Ariz.) 



Figure 1018.— Distribution of 

 Leptochloa fascicularis. 



25 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, the apex 



obtuse, the nerves sparingly pubescent, the lateral close to the margin. 



© — Marshes, mostly near the coast, Louisiana (Cameron) and 



Texas; also eastern Mexico. 



Figure 1017.— Leptochloa fascicularis. Panicle, X 

 1; two views of floret, X 10. (Hitchcock 7876, 

 Md.) 



