44 



GRAMINE^J. 



4. Spliaerocaryum. 



Spikelets 1-fld. panicled or spicate, gls. 4 : I and 

 II very rarely subequal, II and III awned in 

 P. Cnis-Galli, IV rarely very shortly awned. 



5. Panicum. 



Spikelets dorsally flattened, on one side of slender 



spikes, gls. 4, or the first entirely reduced ; 



others like Panicum 6. Digitaria. 



Spikelets of Panicum, but gl. IV narrowed into 



a short, flattened stipe. 7. Ichnanthes. 



Spikelets innumerable, very minute, densely 



crowded in the capillary branches of a very 



large panicle ; gl. IV setaceously hairy on the 



marginal costae. 8. Thysanolaena. 



Spikelets panicled, branches of panicle produced 



beyond the uppermost spikelets ; gl. I minute, 



hyaline. 9. Chamcer aphis. 



Dio3cious, male spikelets in clustered spikes, fern. 



solitary ; a stout grass, leaves setiformed. 



10. Spinifex. 

 Spikelets awned, except in some sp. of Arundinella. 



Spikelets solitary or fascicled on a simple rachis 

 or the branches of a panicle ; gl. I long awned. 



11. Oplismenus. 



Spikelets of Panicum, but ^marginal nerves of gl. 

 II barbate, and palea of III deeply cleft, IV 



awned 12. Axonopus. 



Spikelets persistent on the pedicels, or gls. I and 

 II separately deciduous, IV deciduous ; usually 

 awned, awn bent. 13. Arundinella. 



ff Spikelets each surrounded by an involucel of bristles. 



14. Setaria. 



