125 
1120.* P. compressus, Linn. 
Native. 
British. 
In the Foss, near York- 
-0. A. Moore. 
1121. P. gramineus, 11 Linn.” 
Native. 
English 
1123. P. ZOSTERiEFOLIUS, Schm . 
Incognit. 
1124. P. crispus, Linn. 
Native. 
British. 
1125. P. perfoliatus, Linn. 
Native. 
British. 
1126. P, lucens, Linn. 
Native. 
British. 
Plentiful in the Foss, 
near York — S. Hailstone, 
0. A. Moor 
Malliam Tarn — J. Backhouse , Jun . In the Mere at Scarborough. 
1127. P. prjelongus, Wulf. Native. Germanic. 
With the preceding species in Malliam Tarn — J. Backhouse, Jun. 
Gormire, near Thirsk. 
1129. P. heterophyllus, Schreb. Native. British. 
Frequent near Bedale ! — T. Simpson. Potteric Carr, near Doncaster 
— 0. A. Moore. Plentiful in Gormire, near Thirsk. 
1130. P. lanceolatus, Smith. Incognit. 
“ Inserted on Mr. Ward’s authority in the first volume of the 
New Botanist’s Guide ; but in the second volume, the name is 
corrected to P. heterophyllus. In the Companion to the Botanical 
Magazine, vol. i., p. 292, Mr. Woods says that in Gormire pool he 
. found a Potamogeton, * which I believe to be P. lanceolatus, but 
without any floating leaves.’ It was also more probably P. 
heterophyllus” — H. G. Watson in litt., 1854. The species which 
grow in Gormire are natans, heterophyllus and prselongus. 
1131. P. rufescens, Schrad. Native 1 . British. 
P.fluitans, Flora, 96. Pond near Scarborough — Jno. S. Roivntree. 
Pond at St. Trinnians, near Richmond — James Ward. 
1132. P. natans, Linn. Native. British. 
1133. P. oblongus, Viv. Native. British. 
Pools and ditches, especially in moory places ; frequent. 
1134. P. plantagineus, Ducr. Native. British. 
In similar situations ; probably not unfrequent. Heslington 
fields, near York ! — G. G. Babington. On the moors between Lune- 
dale and Teesdale — J. Backhouse, Jun. Bogs near the Black beck, 
Baysdale ! — W. Mucld. 
RUPPIA. 
1135. R. maritima, Linn, Native. English? 
The plant so plentiful amongst the Coatham saltmarshes is the 
true mhritima of Linnaeus. I am not aware of the occurrence of 
R. rostellata within the limits of the county ; but a considerable 
portion of our coast line has been as yet only very imperfectly 
explored. 
