the second 2 mm. long, broad, rh(jmboidal, triangular-acute at the apex; flower- 

 ing glumes about 3 mm. long, l)roadly ovate (when spread), obtuse, awnless, 

 glabrous except on the scabrous keel, 3-nerved, the middle nerve prominent, 

 percurrent; the lateral ones marginal, extending about two-thirds the length of 

 the glume, slightly pilose. Palea equaling the glumes, lanceolate-spatulate, trun- 

 cate, and slightly denticulate at the apex, sparingly i^lose on the margins below. 



Type specimen collected in shallow water near Cuernavaca, State of Morelos, altitude 

 1,700 m., 6664 C. G. Pringle, August 22, 1897. 



In habit very much reseml)ling Leptochloa halei, but at once distinguished from that 

 species by its more unequal empty glumes and obtuse awnless flowering\glumes. 



Leptochloa dubia Nees, Syllog. Ratisb. 1: 4 (1824). 



Santiago Papasquiaro, State of Durango, 468 E. Palmer, August, 1896; Durango, 530 

 E. Palmer, August, 1896; Saltillo, State of Coahuila, 381, 382 E. Palmer, Sep- 

 tember, 1898. 



LEPTOCHLOA DUBIA PRINGLE ANA (Kuntze) Scribn. & Merrill, n. comb. 

 {Diphu'hrte duhla jtriny/eana Kuntze,l:ie\'. Gen. PI. 3: 349 (1898).) 



Hills and i)lains near Chihuahua, 422 C. G. Pringle, August, 1885. 



Leptochloa fascicularis (Lam.) A. Gray, Man. Bot. ed. 5, 623 (1867). 



Durango, State of Durango, 254 E. Palmer, June, 1896; Torreon, State of Coahuila, 

 503 E. Palmer, October, 1898, rich, moist ground, along ditches subject to 

 overflow. 



Leptochloa flliformis Presl, Pel. Haenk. 1: 288 (1830). 



Topolobampo, State of Sinaloa, 248 E. Palmer, September, 1897, common on bottom 

 lands. 



LEPTOCHLOA HALEI (Nash) Scribn. & Merrill, n. comb. {Diplachne halei Nash, 

 Bui. N. Y. Bot. Gard. 1: 292 (1899). 



Foothills between Acaponeta and Pedro Paulo, Territorio de Tepic, 1930 J. N. Rose, 

 August 2, 1897. 



This species can scarcely be distinct from Leptochloa floribunda, Doell,' although the 

 details as drawn in the plate representing that species do not agree with our 

 specimens of Leptocldoa halei nor with those of authentic material of Leptochloa 

 floribunda. There is in the U. S. National Herbarium one sheet of Hale's Loui- 

 siana collection and two sheets from the Herbarium Hookerianum, the latter 

 labelled "■Leptochloa floribunda Doell. Ad ripas fluminis Amazonum inter San- 

 tarem et Barra de Rio Negro, Coll. R. Spruce, October, 1850," and also in what 

 is evidently Bentham's handwriting "Texas, Drummoud, No. 322 ex herb. T. C. 

 D(rummond) is identical with this." No. 322 Drummond is cited by Nash as 

 the type of Diplachne halei. 



Doell cited as the type of his species "ad ripas fluminis Amazonum inter Manos et 

 Santarem (Spruce)," and although the material in the National Herbarium may 

 not be of the collection on which Leptochloa floribunda is based, there can be no 

 doubt but that it is typical. 



A careful comparison of the specimens collected by Hale in Louisiana and those 

 collected by Spruce in Brazil proves conclusively that they are the same, and the 

 only hesitation we have in not referring Diplachne halei to Leptochloa floribunda 

 is the fact that details of the latter as drawn by Doell differ somewhat from both 

 our North and South American material. 



Leptochloa mucronata Kunth, Rev. Gram. 1: 91 (1835). 



Rosario, State of Sinaloa, 1542 J. N. Rose, July 7, 1897; San Jose de Guaymas, 270 

 E. Palmer, October 14, 1897; Colima, 22 E. Palmer, July, 1897. 



Pappophorum apertum Munro, Bui. Torr. Bot. Club, 9: 148 (1882). 



Saltillo, State of Coahuila, 256 E. Palmer, June, 1898; 377 E. Palmer, September, 1898. 



^Mart. Fl. Bras. 3^: 89, pA. 26 (1878). 



