CIRC^A — CALLITRICHE. 3OI 



Circsea lutetiana L. British type. Native. Area general. 

 Range 0-400. Frequent in shaded places, ascending to the 

 woods of Fossdale and Gunnerside Gill. 



CEnothera biennis L. Alien. Casually subspontaneous 

 in waste ground in the neighbourhood of gardens. Indigenous 

 in Temperate America. 



Hippuris vulgaris L. British type. Native. Area 876 

 54321. Range 0-250. Frequent in ponds and slow streams 

 in the low country. In the Wiske, Yore, Wharfe, Foss, Der- 

 went, Costa, etc. Bedale, Snape, Pickhill, Guisbrough, Slingsby, 

 Malton, etc. In the Yore district in Semmer Water, in 

 Strands Pasture, Carperby, and in Bishopdale Beck above 

 Thoralby ; J. Percival. 



Myriophyllum verticillatum L. English type. Native. 

 Area 87.5432 i. Range 0-250. Not unfrequent in similar 

 situations to the preceding. Langton, Pickhill, Yarra, South 

 Stockton, Sleddale, Topcliffe, Crambeck, Strensall, in the 

 Wiske and Derwent. 



Myriophyllum spicatum L. British type. Native. Area 

 987.54321. Range 0-400. Frequent in ponds and 

 streams, ascending in Teesdale to Upper Cronkley. 



Myriophyllum alterniflorum DC. British type. Native. 

 Area 76.3 2 i. Range 0-200. Peaty ponds and ditches, 

 with us the rarest of the three species. Askham Bogs, Carlton 

 Carr, Stockton Forest, Gormire, Newtondale, etc. Frequent in 

 many places in the Yore and its tributaries ;y. Percival. 



Callitriche verna L. including C. platycarpa Kutz. British 

 type. Native. Area general. Range 0-750. Common in 

 ponds and slow streams, ascending to the little tarn on the end 

 of the fell on the north of the source of the Swale, and the 

 springs which issue from the Main Limestone of Mickle Fell. 



Callitriche pedunculata DC. British type. Native. 

 Area 98765432. Range 0-350. In similar situations to 

 the preceding throughout the lower zone, but less frequent. 



Sept. 1 389. 



