344 81. POTAMACE. 
1127. Potamogeton prelongus, Wulf. 
Provinces --345--8-101112-1415. Native. 
Lat. 51—58. Berks! Surrey ? — Westmoreland, Moray. 
Zones 1 2 3. Low grounds ; area not sufficiently ascertained. 
Census 9 14 18. Ireland 5. Scottish-intermediate type. 
Europe - - - aus ger fra - net den got nor swe lap. 
Russia --- 3 2. Himalaya. 
— America. 
1129. Potamogeton heterophyllus, Schreb. 
Provinces -2345678910111213141516 18. Native. 
Lat. 50—61. Dorset? Sussex? Kent. — Orkney, Shetland. 
Zones 1 23. Humber to 300 yards. 
Census 16 27 48. Ireland 0. British-english type. 
Europe spa - - aus ger fra cha net den got nor swe lap. 
Russia ? N.B. Much confused with obtusifolius, nitens, poly- 
gonifolius, and other species. 
1129*. Potamogeton nitens, Weber. 
Provinces -------------- 15 16. Native. 
Lat. 55—58. Bute, Perth, Elgin, Nairn. 
Zones - 2 3. Low grounds. 
Census 2 3 4. Ireland 2. Scottish type of distribution. 
Europe - - - aus ger fra cha - den got nor swe. 
Russia --- 8 2. N.B. The P. lanceolatus (Sm.) is made up of this 
and the next species; the Scottish localities belonging to this. 
1129* (1130). Potamogeton Janceolatus, Sm. in part. 
Provinces [1 --- 5] -7--[10-1218 15--18]. Native. 
Lat. 58—54. Isle of Anglesea only, as yet known. 
Zone 1. Low grounds. Confused with P. nitens. 
Census 1 1 1. Ireland? Local type of distribution. 
Europe ? N.B. The Anglesea plant has not been certainly 
identified with any European species. By name it is enu- 
merated in Babington’s list of Iceland plants. 
