136 VASCULAR PLANTS. 



bearded base, and the rudiment of a superior 

 flower reduced to a plumose pedicel. Glumes 

 2, canaliculate, awnless. Palets 2: inferior 

 aristate; superioi 2-carinate. 



2£. leaves flattened; panicles branched. 



12. Stipa, L. 



Spikelets 1-flowered; flowers stipitate. Glumes 

 2, membranaceous, larger than the flower. Pa- 

 lets 2, involute; superior shorter, 2-nerved; 

 inferior aristate with a simple, twisted awn. 

 Ovary stipitate; caryopsis terete, and closely 

 wrapped in the palets. 



% . spikelets pedicillate, paniculate. 



13. Spartina, Schreb. 



Spikelets 1-sided, sessile, 1-flowered: flowers 

 naked, sessile. Glumes 2, carinate, awnless; 

 the upper embracing the lower which is much 

 smaller. Palets 2, awnless; the lower compress- 

 ed; the upper larger, navicular. Ovary sessile. 



U . with creeping rhizome, rigid, and with in- 

 volute leaves. Salt marshes. 



14. Cynodon, Rich. 



Spikelets 1-sided, sessile, 1-flowered, often 

 with rudiment of a superior flower. Glumes 2, 

 carinate, awnless, the upper embracing the low- 

 er. Palets 2; the lower carinate, acute. Ovary 

 sessile. 



