200 HORTUS GRAMINEUS WOBURNENSIS. 



Produce per Acre, 

 dr. qr. lbs. 



At the time the seed is ripe, the produce is — 

 Grass, 14 oz. The produce per acre - 9528 12 



80 dr. of grass weigh, when dry - 40 7 



The produce of the space, ditto - 112 5 



The weight lost by the produce of one acre in drying 4764 6 

 64 dr. of grass afford of nutritive matter 3 3 7 

 The produce of the space, ditto, - 13 O5 3 



The above details shew that this species of meadow cat*s-tail 

 is much inferior even to the lesser variety of the Phkum pratense. 

 It is a very scarce grass, at least as far as my researches have ex- 

 tended, having found it but in one meadow in a wild state. It 

 grows in a clayey soil near a spring in Woburn-park, from which 

 the annexed specimen was propagated. Hares and rabbits neg- 

 lected this grass for the common cotton-grass {Eriophorum an- 

 gustifoliiim), which grew closely adjoining. 



It flowers in the second week of July, and ripens the seed in the 

 end of the same month ; but the seed is seldom good. 



CYNOSURUS erucaformis. Linear-spiked Dog's-tail Grass. 



Specific character : Spike compound ; spikelets scattered, the 

 fruit-bearing ones erect ; calices 1 and 2-flowered ; husks 

 obtuse, boat-shaped ; keel obtuse ; corollas acuminate. 



Obs. — This grass is marked an annual in botanical works, but 

 it is strictly perennial. Before the time of flowering the 

 spikelets are beautifully tinged with crimson on the sides; it 

 deserves a place in the flower-garden, on account of the sin- 

 gularity and beauty of the spike. 



Native of Germany, Russia, and Hudson's Bay. Root fibrous. 

 Perennial. Hort. Kew, ; Host. t. 6. Beckmarmia eruca:- 

 f or mis. 



Experiments. — At the time of flowering, the produce from a 

 clayey loam is — 



Grass, 10 oz. The produce per acre 



80 dr. of grass weigh, when dry 



The produce of the space, ditto 



The weight lost by the produce of one acre in drying 3903 9 8 



