384 BAKER’S NORTH YORKSHIRE, 
Triglochin palustre L. British type. Native Area 
98765432. Range o-600. Frequent in damp places, 
ascending to the plateau of Cronkley Fell and the tarn on the 
Lunedale slope of Mickle Fell. 
Scheuchzeria palustris L. Intermediate type. Native. 
Area 8. Range 50. In the Central Valley in the peat bogs 
of the swampy parts of Leckby Carr. Discovered by Rev. 
James Dalton. 
Potamogeton densus L. English type. Native. Area 
98765.321. Rangeo-1oo. Frequent in ponds and slow 
streams in the low country. 
Potamogeton pectinatus L. British type. Native. 
Area 87654321. Rangeo-250. Frequent in ponds and 
slow streams in the low country, ascending in the Esk district 
into Sleddale, and in the Yore district to Semer Water ; 
J. Percival. A maritime form grows in the salt-water ditches 
at Middlesbrough and Coatham. 
Potamogeton flabellatus Bab.! English type. Native. 
Area 8.6.321. Range otoo. | Plentiful. in the Swale at 
Skipton Bridge and Topcliffe, the Ouse along Clifton Ings, and 
the Derwent below Malton. 
Potamogeton pusillus L. British type. Native. Area 
87654321. Rangeo-350. Frequent in ponds and ditches, 
ascending in Arkengarthdale to the reservoir of the Moulds low- 
level lead-mine. otamogeton compressus L. is reported from a 
pond at St. Trinian’s near Richmond ; James Ward: and the 
Foss at York; O. A. Moore. A plant gathered in clear clay- 
bottomed pits at Dringhouses is referred by Mr. F. A. Lees 
to P. rutilus Wolfg. 
Potamogeton gramineus L. Potamogeton obtusifolius 
M. & K. English type. Native. Area 6. 3. Range 0-100. 
In the Derwent at Crambeck ; Z/ora. Ponds at Castle Howard; 
R. Teesdale. Inthe Mere at Scarborough; 4. Bloxam. Chandler’s 
Whin ponds, and Hob Moor ; G. Webster. Potamogeton zostera- 
