352 HORTUS GRAMINEUS WOBURNENSIS. 



tifolia, Poa aquatica. The seeds vegetate under the like circum- 

 stances as those of the Glyceriafluitam, already mentioned. Birds 

 seem less fond of the seeds of this grass than those of the flote 

 sweet-grass. 



Flowers in the second and third weeks of July. Root perennial 

 and creeping. 



AIR A caspitosa. Turfy Hair-grass, Hassock-grass. 



Specific character: Panicle spreading; florets about the length 

 of the calyx, abrupt, hairy at the base; one of them on a hairy 

 stalk ; awn short, from the bottom of the outer valve ; leaves 

 flat. Sm. Engl. Fl. i. p. 102. Fig. 1. A single Floret, mag- 

 nified. 2. Calyx and included florets. 



Obs. Root fibrous; panicle large, of a fine purple silky ap- 

 pearance ; root-leaves forming dense tufts, extremely rough ; 

 the edges so sharp as to cut the finger when passed between 

 them ; culms from a foot and a half to three feet high ; two, 

 seldom or never three ; flowers in each calyx ; hairy at the 

 base, the lowermost one sitting. E. Bot. 1453 ; Host. 2, 

 t. 43; Flo. Dan. t. 157 ; Moris, s. 8, t. 7, fig. upper; Hort. 

 Gram. Fol. 242. 

 German, Rasen-Schielen. 



Experiments. At the time the seed is ripe, the produce from a 

 strong tenacious clay is 



Produce per Acre, 

 dr. qr. Ibs. 



Grass, 15 oz. The produce per acre - 10209 



80 dr. of grass weigh, when dry 26 7 3010 rv r* 



The produce of the space, ditto - 135 0^ 5 

 The weightiest by the produce of one acre in drying 6891 5 

 64 dr. of grass afford of nutritive matter 2 07 OIQ ^ -.1 

 The produce of the space, ditto 723 



The above details prove the innutritious nature of this grass ; 

 but even if it had greater nutritive powers, the extreme coarseness 

 of the foliage would render it unfit for cultivation. Cattle some- 

 times crop the ends of the young leaves, but in all the instances 

 that have come under my observation, it appeared to be from su- 

 preme necessity. The only point to be considered here, therefore, 

 is how to overcome or destroy it on soils where it has got posses- 

 sion. It delights in moist clayey soils where the water stagnates; 



