208 GRASSES OF BRITAIN. 



PoA POLYNODA (variety) denticulata. 



LyUs Silicious Meadow- Grass. 

 Plate XCII. 



This grass differs from the preceding in the middle rib of the outer 

 palea not being hairy, but mintuely toothed the whole length. Ligule 

 of upper sheath shorter. Base of the floret often furnished with a 

 single convoluted hair. In other respects the two plants are similar. 



This variety was gathered by Mr Lyle near Airth, Stirlingshire. 



Flowers in the first week in July, and ripens its seed early in Au- 

 gust. Of little agricultural importance, the foliage being too scanty. 



Explanation of Plate XCII. Poa polynoda (variety) denticulata^ 

 natural size. 



Fig, 1 . Part of the rachis and branches. 



2. Spikelet, showing the two glumes and three florets. 



3. Glumes. 



4. Floret, showing the two palese ; the large palea toothed the whole length of 



the dorsal rib, and furnished Avith a small convoluted hair at the base. 



5. Outer or large palea opened, showing the five ribs ; the side ribs slightly 



hairy on the lower half. 



6. Ligule of the upper sheath. 



7. Ovarium, pistils, stamens, and scales. 



