70 THE TRUE GRASSES. 



mucronate-pointed, three-nerved ; palea narrow, hyaline, 

 nerveless, two-toothed. 



Species three, in Abyssinia. Position of the genus 

 doubtful. 



Tribe V.— Paniceje. 



Spikelets one- (or occasionally two-) flowered, the 

 second flower S (very rarely £ ), in the axil of the third 

 glume ; arranged in spikes, racemes, or panicles ; axis 

 usually continuous. Flowering glume and palea of the 

 S flower always firmer in texture than the empty glumes, 

 unawned (empty glumes rarely awned). Fruit as in An- 

 dropogonece. 

 A. Spikelets all hermaphrodite. 



a. Spikelets neither sunken in an excavation in the 

 rachis nor subtended by a large leaf-sheath. 

 a. Spikelets without any special covering consist- 

 ing of bristles or spines (sterile branches). 



I. Empty glume one 56. Reimaria. 



II. Empty glumes two, £ flower single. 



1°. Lower empty glume with a swollen 

 ring-like callus. . . . 60. Eriochloa. 

 2°. Lower empty glume without a ring-like 

 and swollen callus. 



* Spikelets in one-sided racemes or 

 spikes, these frequently in pairs or 

 in panicles. . . . 57. Paspalum. 

 ** Spikelets in panicles. 



O All the spikelets alike, fertile, 

 in terminal panicles. 



58. Anthsenantia. 

 O O Spikelets of two kinds : first, 

 the sterile, borne on a terminal 

 panicle ; second, the fertile, 

 borne on short subterranean 

 branches. . 59. Amphicarpum. 

 III. Empty glumes two, and $ flowers two. 



61. Isachne. 



