HORTUS GRAMINEUS WOBURNENSIS. 115 



and tall brome-grass (hromus giganteus). There exists no 

 difference in the structure of those grasses subject to the dis- 

 ease, to distinguish them from those that are always affected 

 by it when transplanted to exposed situations, only that 

 the former grasses are smooth, or have their surface free from 

 hairs, while the latter are in general hairy, or have their sur- 

 face furnished with numerous hairs. The bromus sylvaticus 

 (wood brome-grass), and festiica 2}innata{ spiked wood fescue), 

 are subject to the rust likewise, when taken from their natu- 

 ral places of growth : these grasses have hairs, but they are 

 minute, and thinly scattered on the leaves. The early 

 growth of this grass in the spring, and its remarkably fine, 

 succulent, and nutritive herbage, recommend it strongly for 

 admission into the company of the superior permanent pas- 

 ture grasses. 



The wood meadow-grass flowers in the third week of June, 

 and ripens the seed in the end of July. 



POA angustifolia. Narrow-leaved meadow-grass. 



Poa pratensis, var. : Panicle diffused ; spikelets four- 

 flowered, pubescent ; culm erect, round. 



Obs. — Sir James Edward Smith regards this as a variety 

 of the poa pratemis, and its botanical characters are 

 certainly not sufficient to constitute it a species distinct 

 from poa pratensis ; but as it differs much from that spe- 

 cies in its agricultural merits, being much superior, I 

 have kept it distinct from that species, that it may more 

 readily impress the memory. Native of Britain. Root 

 creeping. Perennial. 



Experiments — At the time of flowering, the produce from 

 a brown loam is 18,376 lbs. per acre. 



The produce of latter-math is 12,251 lbs. per acre. 



The proportional value in which the grass, at the time the 

 seed is ripe, exceeds that at the time of flowering, is as 

 21 to 20. 



In the early growth of the leaves of this species of poa, 

 there is a striking proof that the property of coming early 

 into flower is not always connected with the early growth 

 and produce of herbage in the spring. In this respect, 



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