DESCRIPTIONS OF mmES" ) AND GENERA 



the $ upon the lower portion of the p v 

 panicles, without empty glumes; 

 flowering glume narrow and 

 acuminate -pointed ; $ spikelets 

 ovate ; empty glumes two, her- 

 baceous, pointed or awned ; 

 flowering glume much shorter, 

 cartilaginous. Lodicules three. 

 Leaves broad, netted-veined, 

 often with short petioles. 



Species twenty, all, with the 

 exception of one in Africa, from 

 tropical America. 



Tribe VI.— Oryzeje. 



Spikelets £ or unisexual, 

 one-flowered ; flowers apparently 

 terminal and enclosed by a 

 flowering glume and a palea 

 which is usually one-nerved. 

 Empty glumes two or none, 

 very seldom numerous. Sta- 

 mens frequently six. Stigmas 

 more or less elongated, fruit 

 usually with a small embryo 

 and long, linear hilum. Starch-grains compound. 

 A. Spikelets unisexual ; plants monoecious ; anthers six or 



more. 



a. Spikelets in short, solitary spikes, terminal and 

 axillary 78. Hydrochloa. 



b. Spikelets in panicles, or spikes arranged in 

 panicles. 



a. Spikelets in pairs at each node of the panicle- 

 branches ; one large, $ , sessile, the other small, 

 $ , long-pedicelled. 

 I. Flowering glume linear-oblong. 



79. Pharus. 

 II. Flowering glume inflated, globose, closed 

 excepting a hole at the point. 



80. Leptaspis. 



Fig. 35.—Olyra micrantha Hutnb. 

 and Kunth. A ]4 natural size. 

 (After Kunth, Revis. Gram. pi. 

 12.) 



