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28. Poa L. 

 Spikelets 2- co-flowered. Glumes 2, obtuse. 

 Palets 2, both deciduous, lower cariuate, upper 

 2-carinate. Ovary sessile. 



1. P. DISTANS Grieseb. Lower palet round- 

 ed; all leaves short and narrow, mostly convo- 

 lute. — U- San Francisco. Summer. 



2. P. Californica Munro Ms. Dioecious; 

 lower palet rounded; radical leaves half as 

 long as the culm, mostly flat; culm-leaves short, 

 frequently reduced to a mucro. — U- San 

 Francisco. Summer. 



3. P. TENUIFOLIA Nutt. Lower palet round- 

 ed; radical leaves exceedingly narrow, mucro- 

 nate; culm-leaves but little wider. — 0. San 

 Francisco. Spring. 



4. P. scABPiELLA Gray. Dioecious; lower 

 palet rounded, leaves carinate. — U- Oak- 

 land. Summer. 



5. P. ANNUA L. Lowerpalet acute; branches 

 of the panicle single or in pairs; all leaves flat. 

 0. Common. Spring. 



6. P. PEATENSis L. Florets ^ ; lowei palet 

 acute; branches of the panicle mostly in fives; 

 the entire plant smooth, only the margins of 

 the leaves slightly scabrous.— 2£ . Common. 

 Summer. 



7. P. TRiviALis L. Florets ^ : lower palet 

 acute; branches of the panicle mostly in fives; 

 the entire plant rough. — U . Common. Summer. 



