SLATER : FLORA OF RIPON. 1 65 



121 1. Arum macu latum. Cuckoo-pint. Hedges and 

 woods, common. 



1213. Lemna trisulca. Ivy-leaved duckweed. Stagnant 



water, not common. Sharow mires ; Bishopton 

 (Plues). 



1 2 14. L. minor. Common duckweed. Stagnant water, 



common. 

 1216. L. polyrhiza. Greater duckweed. Stagnant water, 



rare. Sharow mires. 

 1218. Potamogeton natans. Broad-leaved pond-weed. 



Still water, common. 

 1227. P. lucens. Transparent pond-weed. Still parts of 



Ure, not common. 



1230. P. perfoliatus. Perfoliate pond-weed. Still water and 



ponds, not uncommon. 



1231. P. crispus. Curled pond-weed. Not uncommon in 



Ure ; plentiful in the canal. 



1232. P. densus. Close-leaved pond-weed. River Ure, 



common. 



1234. P. acutifolius. I found what I take to be this plant, 

 from its ifiattened stem and acuminate leaves, in one 

 of the ditches between the mouth of the canal and 

 Newby Ferry. Should be looked for. 



1237. P. pusillus. Little pond-weed. Ponds, &c., not un- 

 common. Sharow mires, &c. 



1239c. P. flabellatus. This is one of the rarer plants found 

 near Ripon. It will be seen in considerable plenty in 

 the Ure, especially below Hewick Bridge, in rapidly 

 running water, forming sometimes considerable patches 

 or beds. 



1 241. Zannichellia palustris. Horned pond-weed. Still 



water, common. River Ure, and canal ; Sharow 

 mires, &c. 



1242. Z. pedicillata, with long pedicels, occasionally found in 



all the above places. 



