TRIANDRIA.— DIGYNIA. 27 



44. ORYZOPSIS. Cal. 1-flowerecl, 2-valved ; valves 

 membranaceous, nearly equal, loose, obovate. 

 awnless. Cor. 2-valved, coriaceous, cylindrical-ovate, 

 hairy at the base ; the inferior valve awned at tip. 

 JVect. linear, elongated. 



DIGYNIA. 



A. Flowers all perfect. 



| Spikelets 1-Jlowered. 



* Cal. 0. 



15. LEERSIA. Cal. 0. Cor. 2-valved, closed ; valves 

 compressed, boat-shaped. JVect. obovate, entire, 

 collateral. 



* * Cal. 2-valved. 

 a. Cor. without abortive rudiments at the base. 

 1, Glumes and corolla of dissimilar texture ; the inferior 

 valve involving the superior. 



«. Cor. unarmed. 



16. PASPALUM. Ft. in unilateral spikes. Cal, 2-valved, 



membranaceous, equal, nearly orbicular. Cor. carti- 

 laginous, of the size and form of the calyx. Stig. 

 plumose, coloured. JVect. collateral. 



17. MILIUM. Cal. 2-valved, herbaceous. Cor. 2-valved. 



coviaceous, oblong, concave, shorter than the calyx, 

 awnless. Seed 2-hornecl. JVect. collateral. 



/3. Cor. armed or bristled at the tip. 



48. PIPTATHERU >. Cal. membranaceous, longet than 



the corolla. Cor. cartilaginous, elliptical ; inferior 

 valve awned at the tip. Nect. ovate, entire. Seed 

 coated. 



19. STIPA. Cal. 2-valved, membranaceous. Cor. 2- 

 valved, shorter than the calyx, coriaceous, involute, 

 subcylindric ; awn terminal, contorted near the base. 

 Seed coated. 



">0. AR1STIDA. Cal. 2-valved, membranaceous, une- 

 qual. Cor. 2-valved, pedicellate, subcylindric ; in- 



