440 



POACE.E. 



smaller, second not as long as the S2)ikelet ; floral glume obtuse, 3- 

 nerved; j^alea 2-nerved. Lodicules long, obtuse. Pistillate flowers 

 arranged in a one-sided sjjike. First empty glume sliort, obtuse, 

 pilose, second coriaceous, involute, tipped by 3 long awns; floral 

 glume large, compressed, 2-lobed, with a sterile rudiment above 

 bearing 2-3 awns; palea shorter than its glume, obtuse, 2-keeled, 

 enclosing the compressed mucronate and subcordate grain ; pericarp 

 loose. Lodicules lanceolate. 



Fig. si.— Opizia stolonifera. Spikelets. (Scribner.) 

 A low creeping grass with short rigid flat or conduplicate leaf- 

 blades. 



One sjoecies known, and that is found in Mexico. 



1. 0. stolonifera Presl, 1. c. Casiostega anomola Rupr. Bull. 



