ORYZE/E 123 



CHAPTER VII. 



TRIBES II AND III— ORYZE^ AND ZOYSIE^). 



Oryzeaa is a very small tribe with a few genera, which usually 

 flourish in marshes. The spikelets are in panicles, I-fiowered 

 and the flower is usually perfect. In Oryza there are three glumes, 

 the first two being very minute, and there is only a single glume in 

 Leersia and Hygrorhiza. There are usually six stamens. The 

 palea becomes firm in texture like the glume instead of remaining 

 hyaline, and so it is often mistaken for a glume. The spikelets 

 are jointed on their pedicels and fall away from them. 



Not floating ; spikelet not awned ... II. Leersia. 



Floating; spikelets awned ... ... 12. Hygrorhiza. 



Zoysieae is another small tribe with half a dozen genera. The 

 inflorescence is either a spike-like raceme or a spiciform panicle. 

 The spikelets are solitary in Perotis, binate in Tragus and grouped 

 • in Trachys. There is usually a complete flower in a spikelet and 

 the glumes are membranous. Mature spikelets are deciduous with 

 their pedicels singly in Perotis and in clusters in others. 



Spikelets fascicled unilaterally on a 

 broad rachis, 4-glumed, glumes not 

 echinate ... ... ... ... ... 13. Trachys. 



Spikelets binate and all round the 



rachis, 3-glumed, glumes echinate ... 14. Tragus. 



Spikelets single, awned and 3-glumed. 15. Perotis, 



