OF ARTS AND SCIENCES. 173 



Panicum divaricatum, Linn. At Guanajuato (Duges) ; " Ota- 

 tillo pequeno." In fruit, and usually with one or more of tlie glumes 

 black. 



Panicum ? A slender erect yellowish annual, many-stemmed, 



a foot or two high, with small acuminate spikelets in loose narrow 

 panicles. It is the same as n. 286 of Drummond's second Texan 

 collection, and is referred by Dr. Vasey to P. giganteum, Scheele, 

 which however is probably only a form of P. agrostoides. — In the 

 mountains west of Saltillo, Coahuila (1338). 



Oplismenus setarius, Roem. &o Schult. At Georgetown, Texas 

 (1339). Common in the Southern States, and usually referred to 

 0. hirtellus {^Panicum hirtellum^ Linn.). 



Setaria imberbis, Roem. & Schult. At Parras, Coahuila (1363), 

 and at San Luis Potosi (1042, and 1043 in part, SchafFner). 



Setaria glauca, Beauv. At San Luis Potosi (1041 Schaffner). 



Setaria uniseta, Fourn., as named at Kew. {TJrochloa uniseta, 

 Presl. Panicum imisetum, Trin.) At San Luis Potosi (1043 SchafF- 

 ner, in part) ; 957 Parry & Palmer. Also a dwarf form, 1 to 3 

 inches high ; in the San Miguelito Mountains (1044 Schaffner). 



Cenchrus tribuloides, Linn. At Guadalupe, Texas (1342), 

 and at San Luis Potosi (1046 Schaffner). 



Cenchrus echinatus, Linn. At Mouclova, Coahuila (1343). 



Coix arundinacea, Lam. (?) At Saltillo (1337). Tall and 

 stout, probably perennial : fruit globose-ovate, as broad as long. Cul- 

 tivated in the Botanic Garden at Cambridge, it had reached a height 

 of 8 or 10 feet when it was cut down by the frost. 



-S^GOPOGON cenchroides, Humb. &, Bonpl. At San Luis Potosi 

 (1060 Schaffner) ; 942 Parry & Palmer. 



Tragus racemosus, Desf. At Soledad, Coahuila (1344), and at 

 San Luis Potosi (1047 Schaffner) ; 952 Parry & Palmer. 



Sciiaffnera gracilis, Benth. in Hook. Icon. t. 1378. In the 

 San Miguelito Mountains (1070 Schaffner). 



Trachypogon Montufari, Nees. At San Luis Potosi (1063 

 Schaffner) ; 964 Parry & Palmer. 



Heteropogon contortus, Roem. & Schult. At Monclova, Coa- 

 huila (1346), and at Morales, San Luis Potosi (1051 Schaffner) ; 955 

 Parry & Palmer. 



Andropogon laguroides, DC. At Monclova, Coahuila (1347); 

 the same as 233 and 2969 Bourgeau (so named by Fournier), and 667 

 Botteri. It was collected in Texas by Berlandier (444 and 1764), 

 and recently by Pringle in Arizona (distributed as A. Torreyanus). 



