104 THE TRUE GRASSES. 



Clomena Beauv., and Calycodon Nutt. are all founded 

 upon one or several species of this genus. Clomena 

 Beauv., to which Bealia Scrib. belongs, found in Mexico 

 and Peru, forms a sub-genus characterized by the two- 

 toothed flowering glume which is awned between the 

 teeth.* 



109. (114) Brachyelytrum Beauv. Panicles with few 

 spikelets ; spikelets long and narrow ; empty glumes 

 minute ; flowering glume with a long straight awn. 



Species one (B. aristatum Beauv.), in North America. 



110. Podophorus Philippi. Panicles open ; flowering 

 glumes longer than the empty ones, narrow, involute, 

 with a pointed and short-bearded callus ; awn geniculate 

 near the base, but not twisted. Bachilla prolonged, fre- 

 quently bearing an awned, rudimentary glume. 



Species one (P. bromoides Ph.), upon the island of 

 Juan Fernandez. 



111. (116) Lycurus Kunth (Pleopogon Nutt.). Spike- 

 lets small, narrow, the upper one of each pair $ , the 

 lower $ or sterile. Lower empty glumes with 2-3 awns, 

 the upper one and the flowering glume with only one. 



Species two, in Mexico and New Mexico. 



112. (115) Perieilema Presl. Panicles spike-like or 

 interrupted, covered with the numberless awns (espe- 

 cially of the sterile spikelets). Palea and all the glumes 

 awned. 



Species three, in Mexico and tropical America. 



* I cannot agree with Prof. Hackel in this disposition of Bealia (Fig. 

 45). There are several species of Muhlenbergia which have the flower- 

 ing glume two-toothed, the awn arising from between the teeth, which 

 certainly do not belong to the sub-genus or section Clomena. This sub- 

 genus is best characterized by the broad, three-nerved and three-toothed 

 second empty glume. The flowering glume closely envelops the 

 conical or ovoid grain. In Bealia the empty glumes are entire, sub- 

 equal, nerveless (or very faintly many-nerved), and the elongated grain 

 is only loosely enclosed by the broad and deeply two-toothed flowering 

 glume. The habit of Bealia somewhat resembles that of the typical 

 Clomena, and I at first named it Muhlenbergia Clomenoides, but the 

 characters presented by the empty glumes, flowering glumes, and grain 

 are so unlike the true Muhlenbergias that I can but consider it geueri- 

 cally distinct. F. L. 8. 



