HORTUS GRAMINEUS WOBURNENSJS. 265 



Obs. This plant differs from the Fesluca glauca of Host. (t. 88) 

 in the stem, which is round, smooth, and straight. The leaves 

 are longer and smooth; the spikelets less spear-shaped; 

 the panicle is contracted before and after flowering : spikelets 

 5-7 flowered ; awns short and rigid. Mr. Curtis, in his enu- 

 meration of British grasses, mentions this as indigenous ; and 

 on this authority it is here entered, as I never could find it in 

 its natural state. There is a variety of this species with 

 subulate leaves, which grow in dense tufts ; every part of the 

 plant is smaller than the first variety, and from a difference in 

 the shade of colour, may be called var. glaucescens. 



German, Graugruner-Schwingel. 



Native of Britain. Root perennial, fibrous. 



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



brown loam is 



Produce per Acre, 

 dr. qr. Ibs. 



Grass, 14 oz. The produce per acre 9528 12 



80 dr. of grass weigh, when dry 32 ^ 



The produce of the space, ditto 89 2-f 3 



The weight lost by the produce of one acre in drying 57 17 4 

 64 dr. of grass afford of nutritive matter 3 7 

 The produce of the space, ditto 10 2 3 



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 32 7 



The produce of the space, ditto 89 2f 3 



The weight lost by the produce of one acre in drying 5717 4 

 64 dr. of grass afford of nutritive matter 127 ooo z A 

 The produce of the space, ditto - 513 

 The proportional value in which the grass, at the time 



of flowering, is superior to that at the time the seed 



is ripe, is as 2 to 1. 



The produce of the latter-math is 



Grass, 7 oz. The produce per acre 4764 6 



64 dr. of grass afford of nutritive matter 1 2 111 10 10 



The proportional difference between the flowering and seed 

 crops of this grass is directly the reverse of that of the Poa trivi- 

 alis ; and it affords one out of many proofs that might be brought 

 forward, of the value of the culms in grasses intended for hay. 

 The culms at the time of flowering are of a very succulent nature ; 



