176 PROCEEDINGS OF THE AMERICAN ACADEMY 



Agrostis verticillata, Vill. At Parras, Coaliuila (2019), and 

 at San Luis Potosi (1022 Schaffner). 



Agrostis scabra, Willd. At San Luis Potosi (1033 ScliaiFner). 



MiCROCHLOA SETACEA, R. Br. Same locality (1000 Schaffner) ; 

 970 Parry & Palmer. 



Chloris cdcullata, Bisch. At Sutherland Springs, Texas; a 

 single specimen. 



Chloris elegans, HBK. (C. alba, Presl.) At Parras, and in 

 the Morales Mountains, (1073 Schaffner) ; 961 Parry & Palmer. 



Chloris submutica, HBK. San Luis Potosi (1074 Schaffner). 



Chloris ? Very near C. verticillata, Nutt., but the flowers 



narrower and somewhat longer. Same locality (1072 Schaffner) ; 

 445 Bourgeau and 723 Botteri. 



BouTELOUA tenuis, Gi'iseb. At San Luis Potosi (1011, 1012, 

 1013 Schaffner). These specimens correspond very closely with the 

 description and figure of Chondrosivm temie, HBK. (Nov. Gen. 1. 

 176, t. 57), and especially in their erect habit and convolute-filiform 

 leaves. The tufts are densely cespitose and the root apparently peren- 

 nial. The South American specimens referred to this species by 

 Grisebach (PI. Lorentz. 211, and Symb. Fl. Arg. 303) belong rather 

 to J^. simplex, Lag. 



BouTELOUA PROSTRATA, Lag. {Chondrosium humile, HBK., 1. c, 

 175, t. 56.) A loosely cespitose slender many-stemmed annual, ge- 

 niculate and decumbent, or procumbent and rooting at base ; leaves ^ 

 to 1 line broad, flat or somewhat convolute. A sjjike in herb. Gray 

 from Lagasca's original specimens, together with the fuller description 

 given by Roemer & Schultes, leaves little doubt respecting the iden- 

 tification of the species. It differs, however, but little from the South 

 American B. simplex, Lag. — At Monclova, Coahuila (1358), and at 

 San Luis Potosi (1016 Schaffner) ; 751 Bourgeau. Collected also in 

 New Mexico by Fendler (939) and by G. R. Vasey. 



BouTELOUA scoRPioiDES, Lag. (?) Dwarf, cespitose and stolon- 

 iferous, glabrous : leaves mostly flat, ^ to I line wide : culms shorter 

 than the leaves (2 or 3 inches high), bearing a single loose strongly 

 circinate spike about an inch long: spikelets about 15, mostly in 

 pairs : lower glumes very narrow, acuminate, slightly villous, the 

 upper 3 lines, the lower 2 lines long ; flowering glume with 3 slender 

 awns (I inch long) and usually 2 or 3 shorter ones at their base ; 

 palea bicuspidate ; sterile flower bearded at base, 5-6-awned. — At 

 San Luis Potosi (1010 Schaffner). Lagasca's species is known only 

 from his very short and imperfect description. 



