168 BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 



Pleuraphis Torr., Ann. Lye. N. Y. 1: 148, pi. 10. 1824. Type species P. 

 jamesii Torr., the only one described. 



Hexarrhena Presl, Rel. Haenk. 1: 326, pi. 45. 1830. Type species H. cen- 

 chroides Presl, the only one described. This is the same as Hilaria cen- 

 chroides. 



FIG. 98. Curly mesquite, Hilaria belangeri. Plant, X 1 ; single spike, X 1 ; group of 

 spikelets seen from front or outside, showing staminate spikelets in front and top of 

 fertile spikelet behind, X 5 ; same group from behind or next the axis, showing the 

 fertile spikelet in front and the two staminate spikelets behind, X 5 ; fertile spikelet 

 as seen from the inside, X 5 ; fertile floret, X 5 ; staminate spikelet, X 5. 



Schleropelta Buckl., Prel. Rep. Geol. and Agr. Surv. Tex. App. 1. 1866. A 

 single species is included, S. stolonifera Buckl., which is the same as Hilaria 

 lelangeri Steud. 



Hilaria belangeri Steud. (fig. 98) is a common grass on the Great 

 Plains of Texas and northern Mexico. In Texas it is called curly 



