158 THE TRUE GRASSES. 



Sub tribe F. — Centotheceae. 

 Leaves broad, netted-veined. 



237* (239) Centotheca Desv. Panicles expanded ; spike- 

 lets small; flowering glumes rounded on the back, 

 5-7-nerved, awnless, but usually with hooked appendages 

 or small protuberances on the keel. 



Species three, in tropical Africa, Asia, and especially 

 the South Sea Islands. 



238. (243) Zeugites Schreb. (Smites Adans., Despretzia 

 Kunth, Krombholzia Fourn.). Spikelets panicled, many- 

 flowered, but only the lowest fertile, the very broad empty 

 glumes approximate ; the upper £ , distant ; -leaves ovate. 



Species five, in tropical America and Mexico. 



239. (240) Orthoclada Beauv. Panicles diffuse ; spike- 

 lets lanceolate, compressed, one-flowered, with a long 

 prolongation of the rachilla (rarely two-flowered without 

 this prolongation) ; fruit strongly compressed laterally. 



Species one (0. rariflora Beauv.), with petiolate, 

 broad lanceolate leaves ; in tropical America. 



240. (241) Lophatherum Brongn. (Acroelytrum Steud. 

 and Attetotheca Steud.). Spikelets often two-ranked 

 (rarely scattered), sessile on the branches of the panicle, 

 linear, one-flowered, with a tuft of sterile glumes at the 

 point. Empty glumes two ; flowering glumes pointed or 

 short-awned. 



Species three, in the East Indies in the Sunda Archi- 

 pelago to Japan. 



241. Pcecilostachys Hackel. Spikelets in pairs on the 

 spike-like branches of the panicle ; empty glumes three, 

 no sterile glumes at apex. A sterile flower is often 

 found in the axil of the third glume. 



Species two, P. Hildebrandtii and P. geminata Hack., in 

 Madagascar. 



242. (242) Streptogyne Beauv. Spikelets large, linear, 

 almost sessile ; first empty glume short, the second as well 

 as the flowering glume involute, many-nerved, the latter 

 short-awned, and with 1-3 empty falcate glumes above it. 



Species one (St. crinita Link), in the tropics of both 

 hemispheres. The detached fruiting glumes hang for a 



