TRIANDRIA DIGYNIA. Poa. 23 



grass. The fine sharp bran is said to Icill intestinal worms in 

 horses. Lin. Fl. Suec. The flowers, Uke those of Aira aquaiica, 

 have a sweet taste. 



G. rigida. Hard Stv. Panicle spear-shaped, very rigid, 

 leaning- one way, two-ranked, close, with smooth stalks ; 

 branchlets alternate, the main one bordered. Florets 

 about seven, acute, scarcely ribbed. Poa rigida. E. 

 B. 1371. C. 2. 4, Sb. 42. 



Walls, dry ground. 

 An. May. 



May be known readily by the extreme rigidity of its stems, and 

 panicle. E. B. The whole plant generally assumes a brown or 

 purplish hue, remaining bleached and dry after midsummer. 



POA. Meadow-grass. 



P. compressa. Flat-stalked 31. Panicle leaning one 

 way, rather close. Culm compressed. Root creeping. 

 Spikelets egg-shaped oblong. Florets connected by a 

 web. E. B. 365. 



Tops of walls, dry barren ground. 

 Per. June. 



Easily distinguished by its compressed stem. Cannot be cultivated 

 in moist, or manured ground. Its produce not abundant. Sm. 



P. trividlis. Roughish M. Panicle spreading. Spike- 

 lets about three-flowered. Florets spear-shaped, five- 

 ribbed, connected by a web. Stipula lengthened out, 

 tapering to a point. Stem and leaves roughish. Root 

 fibrous. E. B. 1072. C. 2. 6. 



Meadows, pastures. — 



Per. June. 



One of the most valuable for pasturage, and hay, yielding abun- 

 dantly, though not particvilarly early. Curtis. 



P. pratensis. Smooth-stalked M, Panicle spreading. 

 Spikelets about four-flowered. Florets spear-shaped, 

 five-ribbed, connected by a web. Stipula short and 

 blunt. Stem and leaves smooth. Root creeping. E. 

 B. 1073. C. 2. 5. Gramen pratense minus. G. 

 E. 2. 



Walls, pastures. 

 Per. May. 



The clear and essential mark of this species, compared with the 

 last, consists in its very short, abrupt, pointless stipula, which in 

 every leaf, and every variety, proves constant and invariable. P. 



