l62 YORKSHIRE NATURALISTS' UNION. 



1108. R. Acetosella. Sheep's sorrel. Dry places, common. 

 Remarkably abundant at Plumpton Rocks. 



nil. Polygonum Convolvulus. Black bindweed. Corn- 

 fields, abundant. 



1 1 13. P. aviculare. Knot-grass. Roadsides, fields, and 

 waste ground, abundant. Several varieties occur, 

 amongst which may be mentioned vulgaium, agresti- 

 num, arenastrum (by Ure), and microspervmm. 



1 1 16. P. Hydropiper. Biting persicaria. Wet places, 



abundant. 



111 7. P. minus. Small persicaria. Wet places. Near 



Ripon (Baines). 



1 1 18. P. mite. Lax-flowered persicaria. Wet places, rare. 



Ure Bank district (Lees, 1. c). 



1 1 19. P. Persicaria. Common persicaria. Waste ground 



and damp places, common. 



1120. P. lapathifolium. Pale flowered persicaria. Waste 



ground and wet places, common. 

 1122. P.amphibium, Amphibious persicaria. Var. 1!^, /^rr^j-/;-^ 

 is apt to be a noisome weed occasionally. 



■1123. P. Bistorta. Snake-weed. Moist meadows and woods, 

 local. Near the Training College in a field which 

 wants draining ; Fountains, &c. 



1127. Daphne laureola. Spurge laurel. Woods, rare, and 



often doubtfully indigenous. Studley; Knaresborough 



(Baines). 

 1 130. Aristolochia Clematitis. Birthwort. An alien 



sometimes found near old ruins. Studley district 



(Lees, 1. c). 

 1 132. Buxus sempervirens. Box. Studley woods, 



naturalized. 

 1134. Euphorbia Helioscopia. Sun spurge. Gardens and 



waste ground, common. 



Trans. Y.N. U., 18S3 (pub. 1884). Series E 



