NORTH AMERICAN SPECIES OF LEPTOCHLOA. 



19 



Leptochloa virletii Fourn. PI. Mex. 2: 147, 1886. San Luis de Potosi" (Virl., 

 n. 1404). Type specimen examined at Paris. 



Rabdochloa imbricata Kuntze. Rev. Gen. 3: 788, 1891. Transfers Leptochloa 

 imbricata Thurb. 



Resembles in habit L. fascicularis Gray. The panicle is more oblong in outline, 

 being more compact and with shorter branches, and often dark colored and 

 more exserted. Spikelets also resembling L. fascicularis, but the empty 

 glumes are broader and more obtuse, and the flowering glumes are somewhat 

 apiculate but not awned. 



Fig. 14. — L. imbricata. 



Distribution: Arizona: Palmer 548, 51; Lemmon 360; Vasey 540. California: 

 Wright 2118; Coulter 776. Texas: Tracy 7367. Mexico: Palmer 47, 134, 331, 

 216, 5; Mearns 2741. Argentina: Hieronymus 1088. Paraguay: Morong 981. 



There is a Leptochloa verticillata from the East Indies (Kunth Gram. 1: 91, 1835. 

 Eleusine verticillata Roxb., Hort. Beng. 8. 1814). 



Diplachne tarapacarum Philippi f rom Chili appears to belong here, judging from 

 the specimen in herbarium U. S. D. A. (Anal. Mus. Nac. Chili. Bot. 88. 1891.) 



LEPTOCHLOA SPICATA Scribn. Proc. Acad. Sci. Phila., 1891. 

 Transfers Diplachne spicata. (Fig. 15.) 



304. 1891. 



Fig. 15.— L. spicata. 



Bromus spicatus Nees. Agrost. Bras., 471. 1829. "Habitat in campis, campo 

 mimoso dictis, provinciae Piauhianse." Nees observes that in habit this 

 forms a transition to Brachypodium or Agropyron, but differs in the few 

 nerved glumes; nor does it fit in Diplachne any better, since the native species 

 has the glumes not at all apiculate, and foreign species differ much otherwise. 



