OF ARTS AND SCIENCES. 181 



panicle very diffuse, the branchlets pubescent; spikelets ovate-oblong, 

 6- 1 0-flowered ; glumes thin, 1-nerved, blunt or shortly mucronate, 

 glabrous; flowering glume villous toward the base upon the 3 greeu 

 nerves, the middle nerve shortly excurrent between the short teeth ; 

 palea glabrous. — At Monclova, Coahuila (1371) ; also in Western 

 Texas and New Mexico (776, 777 and 2045 Wright). 



Triodia Schaffneri. a dwarf cespitose slender annual (?), with 

 fibrous roots, very sparingly villous, the culms 2 or 3 inches high, 

 exceeding the very narrow leaves and bearing a single somewhat 

 1-sided spike (1 to 1^ inches long) of rather scattered greenish spike- 

 lets (8 to 15), which are linear-lanceolate, 6-10-flo\vered, 2 lines long ; 

 I'hachis of the spikelets villous-pubescent : lower glumes glabrous, 

 carinate, 1-nerved, obtusish, finely toothed at the apex ; flowering 

 glume glabrous, 3-nerved, the lateral nerves ceasing below the mar- 

 gin, the middle produced into a short awn between the broad obtuse 

 teeth. — In the Escabrillos Mountains, San Luis Potosi (1077 Schaff- 

 ner). Closely resembling in habit the Cuban Tricuspis simplex of 

 Grisebach, and Dijilachne spicata, Doell, of Brazil. It is clearly a 

 Triodia, as the genus is defined by Mr. Benthara. 



Leptochloa MUCRONATA, Kunth. At Monclova (1364). 



DiPLACHNE FAScicuLARis, Beauv. At San Luis Potosi (1048 

 SchafFner). 



DiPLACHNE DUBfA, Benth. At the same locality (1079 Schaffner). 



ScLEROPOGON Karwixskyanus, Benth. {Lesourdia Karwinsky- 

 ana, Fourn. in Bull. Soc. Bot. France, 27. 102, t. 4, fig. 12.) At 

 San Luis Potosi (1005 SchafFuer) and near Morales (1006 Schaffner) ; 

 925 and 949 Parry & Palmer. Perennial ; very variable in length of 

 awns (1 to 5 inches), their number, etc. Fournier's Lesourdia multi- 

 Jlora (1. c, t. 3, 4) appears to be only a short-awned form. As stated 

 by Bentham, both staminate and pistillate spikes occur on the same 

 plant. They are not rarely on the same culm. The plant is common 

 in New Mexico, and was referred by Munro to Tricuspis, — by Torrey 

 to Aristida. 



Arundo Donax, Linn. At Monclova, Coahuila (1345). 



Eragrostis reptans, Nees. At Sutherland Springs, Texas 

 (1369); 1154 Parry «fe Palmer. 



Eragrostis oxylepis, Torr. At the same locality (1370). 



Eragrostis minor, Host. {E. pocsoides, Beauv.) At San Luis 

 Potosi (1027 SchafFner). 



Eragrostis major. Host. (E. megastachja, Link.) At the same 

 locality (1031 Schaffner) ; 934 Parry & Palmer. Also a form with 



