HORTUS GRAMINEUS WOBURNENSIS. 145 



and ripens the seed in the beginning of July. In the best perma- 

 nent pastures the smooth -stalked meadow-grass is, according to 

 all my observations, present ; but in a much smaller proportion 

 than almost any other species of the proper grasses. 



POA subcarulea. Short blue Meadow-grass. 



Specific character : Panicle diffuse ; spikelets oval, generally 

 3-flowered ; husks acute, connected by a villus : , sheath-scale 

 very short, rounded, or very much obtuse. 



Obs. This grass is so nearly allied to the Poa pratensis, that the 

 discriminating characters are hardly sufficient to make them 

 distinct species, This grass has generally three florets in 

 each calyx ; the Poa pratensis has four, and sometimes five ; 

 the panicle is more compact, the culms are shorter, and some- 

 what glaucous ; the leaves are much shorter and broader than 

 those of the Poa pratensis. The sheath-scale in the Poa sub- 

 carulea is rounded ; that of the P. pratensis is only blunt, or 

 much less obtuse. It may be distinguished at some distance 

 from the Poa pratensis, by its delicate sky-blue or glaucous 

 colour. The root, like that of the Poa pratensis , is powerfully 

 creeping. 



Native of Britain. E. Bot. 1004. Poa subcarulea, Hort. Kew. i. 

 155. Poa humilis,}loYi. Gram.Wob. Fol. p. 18. Poacarulea, 

 Sm. Engi. Fl. i. 126. Poa pratensis, var. subcarulea. 



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

 clayey loam enriched with bog earth is 



Produce per Acre, 

 dr. qr. Ibs. 



Grass, 1 1 oz. The produce per acre - 7486 



80 dr. of grass weigh, when dry - 24 ^ 



The produce of the space, ditto 52 3^5 2246 



The weight lost by the produce of one acre in drying 5240 13 



64 dr. of grass afford of nutritive matter 2 i 



The produce of the space, ditto 5 2 J 233 15 7 



At the time the seed is ripe, the produce is 

 Grass, 8 oz. The produce per acre - 5445 



80 dr. of grass weigh, when dry 20 ^ 



The produce of the space, ditto 32 j 



The weight lost by the produce of one acre in drying 4083 12 

 64 dr. of grass afford of nutritive matter 20 } 1 70 9 ft 

 The produce of the space, ditto - 4 3 



