GRAMINE.E. 



45 



** Spikelets persistent on their pedicels, at least the fertile, or 

 deciduous with their pedicels. 

 f Spikelets in involucelled deciduous fascicles. 



15. Penmsetum. 



ft Spikelets not involucelled. 16. Thuarea. 



TRIBE II. ORYZEJS. Spikelets 1-fld., articulate on their pedicels 

 and deciduous from them. Palea 1-3 nerved, stamens 

 6. 



Spikelets 2-sexual, awned or not; gl. 4, I and II 

 minute or setaceous. 17. Oryza. 



Spikelets 2-sexual, awnless ; gls. 2, broad, thin. 



18. Leersia. 



Spikelets 1-fld., unisexual narrow. Panicles long 

 abundantly floriferous androgynous ; gls. 2, 

 Stamens 6. 19. Zizania. 



TRIBE III. ZOYSIE.E. Spikelets 1-fld., deciduous with their pedicels, 

 2-sexual, or some imperfect. 



Spike very slender ; spikelets narrow, gl. I and II 



awned. 20. Perotis. 



Spike rigid ; spikelets appressed to the rachis, not 



awned. 21. Zoysia. 



H. Eachis of inflorescence usually articulate (except Apluda). 



TRIBE IV. ANDROPOGONE^E. Spikelets usually 2-nate, or the termi- 

 nal in the infl. 3-nate, pairs homo- or heterogamous. 

 Fl. gl. smaller than the empty, hyaline, often awned 

 or reduced to an awn. 



Subtribe I. Maydecc. Spikelets spicate, all 1-sexual ; male 

 spikes in terminal panicles, or continuous with fern, 

 spike. 



Fruiting spikelets enclosed in a stony, nut-like 

 polished bract. 22. Coix. 



Fruiting spikelets enclosed in leafy bracts. 



Female spikelets densely crowded on a cylindric 



