HORTUS GRAMINEUS WOBURNENSIS. 345 



preceding. It is subject to the rust, and a peculiar disease which 

 dries up the extremities of the leaves, and gives it an unsightly- 

 appearance. Simple ploughing will be found ineffectual to root 

 out this weed in clayey soils. It will be found ultimately the 

 cheapest and most expeditious mode of extirpating it to follow 

 the plough and fork out the roots. Burning, under such circum- 

 stances of soil, would doubtless be highly beneficial, but the roots 

 of this couch-grass penetrate so deep that a considerable part of 

 them would escape ; and the least particle of the root soon pro- 

 duces a plant. 



Flowers in the second week of August, and the seed is ripe 

 about the latter end of September. 



AGROSTIS stolomfera aristata. Awned Creeping Bent. 



far. 2. Corolla awned ; awn long, and knee-bent at the top of 

 the blossom, fixed below the middle of the back of the larger 

 valve; branches of the panicle very rough. Fig. 1. Calyx. 

 2. Corolla. 



Obs. The first knowledge I had of this variety was from 

 the Duke of Bedford, who pointed it out on Priesley Moor. 

 I have since found it common on peaty moors. It can 

 scarcely be distinguished from the Agr. stolomfera latifolia 

 without examining it in the hand. The runners or stolones 

 extend to a great length ; they are of a brighter reddish 

 colour than those of the lat-ifolia, and every part of the plant 

 is rougher. From these few marks of distinction this variety 

 may have been overlooked, as I find no mention made of it in 

 the botanical works to which I have had access. It is allied 

 to the Agrostis canina or awned var. Agr. vulgaris of Dr. Smith, 

 but differs in the form of the panicle, which is more acumi- 

 nated ; calyx more acuminate ; awn one-third longer, and 

 bent the contrary way, i. e. towards the blossom ; branches 

 rougher ; culms producing stolones. Hort. Gram. Fol. 233. 



Native of Britain. Root perennial. 



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



bog soil is 



Produce per Acre. 

 dr. qr. Ibs. 



Grass, 13 oz. The produce per acre - 8848 



80 dr. of grass weigh, when dry 38 7 4010 12 



The produce of the space, ditto - 98 3 



