80. ALISMACE&. — 81. POTAMACEA. 841 
1117. Scheuchzeria palustris, Linn. 
Provinces ----5--8910----15. Native. 
Lat. 52—57. Salop, Notts, Chester, York, Perth. 
Zones 1 2 ? North Yorkshire at 50 yards. 
Census 5 5 6. Ireland 0. Intermediate type of distribution. 
Europe - - - aus ger fra - net den got nor swe lap. 
Russia -- 4321. Siberia. 
— America. Rocky Mountains. 
1118. Potamogeton densus, Linn. 
Provinces 12345678-1011121814. Native. 
Lat. 50—56. Devon, Wight, Kent. — Lanark, Edinburgh. 
Zones 1 2. Lakes to 340 yards. 
Census 13 24 52. Ireland 6. English type of distribution. 
Europe spa ita tur aus ger fra cha net den. 
Russia - - - 3. 
Algeria. — America ? 
1119. Potamogeton pectinatus, Auct. 
Provinces 12345-789101112131415-1718. Native. 
Lat. 50—60. Cornwall, Wight, Kent. — Orkney. [Shetland ?] 
Zones 123. Tyne to 200 yards. Humber to 150 yards. 
Census 16 28 63. Ireland 9. British type of distribution. 
Europe all, except Finmark. P. flabellatus inclusive. 
Russia 6--3 21. Himalaya. Siberia. 
Algeria. Azores. — Iceland. America. Columbia. 
1119*. Potamogeton filiformis, Nolte. 
Provinces - [2-4--7 8]----- 1415 1718. Native. 
Lat. 56—61. Berwick, Fife, Forfar, Orkney, Shetland, etc. 
Zones ? 2 8. Sub-littoral. Imperfectly on record. 
Census 4 6 6. Ireland 2. Scottish type of distribution. 
Europe spa ita - aus ger fra - - den got - swe. 
Russia 65432. “P. marinus, Linn. spec. 184.” 
Algeria. — Iceland; Bab. cat. America; Gray bot. 
