THE MONOCOTYLEDONES 



2081 



arising from the tip. Inner paleae three- to nine-nerved. 

 Stamens usually six, rarely three, two or even one. 



Fig. 2017. — Orysa. A, Spikelet open, flower in anthesis. B, Spikelet closed. 

 Patuciim. C, Spikelet. D, Flower open. 



The tribe includes nine genera, which are mainly aquatic grasses of 

 temperate and tropical regions. Among the more important genera are 

 Leersia, Oryza and Zismiia. Species of Orysa, especially O. sativa (Fig. 

 2018), yield the Rice of commerce, while Zizania esciile?ita is the source of 



Fig. 2018. — 'Jiyzci sathd. Rice. Panicle in 

 fruit. 



