168 BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 
Pleuraphis Torr., Ann. Lyc. N. Y. 1: 148, pi. 10. 1824. Type species P. 
jamesii Ton*., 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 I ; 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 
belangeri 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 
