272 



POACE.E. 



1-1.5 mm. long, the awn 1.5-3 mm. long; floral glume ovate, acute, 

 with stiff hairs at the hase, scabrous above, 2 mm. long, the slender 

 wavy awn 1-3 cm. long; palea ovate, 1.5 mm. long, nerves very 



Fig. 4B.—PereUema crinita. A, spike; B, spikelet; c, floret; d, floral glumer 



e, grain. (Trinius.) 



near each other. Grain nearly 1 mm. long. The sterile spikelets 

 reduced to clusters of awns. 



Mexico, Pringle 1744. 



2. P. ciliatum Fourn. Hemsl. Biol. Centr. Am. Bot. 3:543 

 (1880). 



Culms branching freely. Leaves like those of P. crinitum. Pan- 

 icle with the base inserted or but little exserted, spikelike, 6-8 cm . 



