FLORA OF THE EAST RIDING OF YORKSHIRE. 1 69 



1323. Polygonum aviculare. Linn., m. 



(Common Knot-grass). 



Native, Brit., 1-7. August. 



Common in clayey fields in several of its varieties ; vars. 

 vulgatum, Syme, and arenastrum, Bor., Welton (C.W.) ; 

 van rurivagum, Jord., on waste ground amongst a host of 

 Chenopodia near West Dock, Hull. 



1326. P. Hydropiper. Linn., 105. 



(Biting Persicaria or Water Pepper). 



Native, Brit., 1-7. Aug., III. 



Frequent in all divisions, Seaton Ross, Marton near 

 Burton Constable, &c. 



1327. P, minus. Huds., 52. 



(Creeping Persicaria). 



Native, Eng. , 2. 



Woodmansey, near Beverley (R.T.). Specimens named 

 minus in Young's collection are only small forms of P. Hydro- 

 piper (J.F.R.). We have not confirmed the record of this 

 plant. 



1329. P. Persicaria. Linn., 112. 



(Knot-grass). 

 Native, Brit., 1-7. August. 



In cultivated places abundant. Var. b. elatum (Gren. and 

 Godr.) amongst the Hull dock aliens. 



1330. P. lapathifolium. Lifin., 103. 



(Pale-flowered Knot-grass). 



Native, Brit, 1-7. August. 



Heslington Fields (B.), near Hull and Hedon. Abundant 

 and luxuriant on the dock wastes. 



J332. P. ampMbium. Linfi., io8. 



(Willow-grass). 

 Native, Brit., 1-7. July, III. 



Common in ponds, drains, and dykes. Var. terrestre, 

 Leers., not infrequent.* 



M 



