81. POTAMACES. 348 
1123, Potamogeton zosterifolius, Schum. 
Provinces - [2] 845 --8-[10]----15. Native. 
Lat. 51—57. [Sussex], Surrey. — East Perth, Forfar. 
Zones 1 2. Low grounds. 
Census 5 8 12. Ireland 1. English type of distribution. 
Europe all, except Lapland and Finmark. 
Russia - -- 3 2. P. compressus, Led. ross. et Fries sum. 
— America. 
1i24. Potamogeton crispus, Linn. 
Provinces 1 to 16 - [18]. Native. [Shetland]. 
Lat. 50—58. Devon, Wight, Kent. — Isla, Elgin. 
Zones 12 3. Humber to 250 yards. Tyne to 200 yards. 
Census 16 82 71. Ireland 11. British-english type. 
Europe all, except Lapland and Finmark. 
Russia 65 432. India. Siberia. 
— Iceland; Hooker’s list, from Zoega. [America]. 
1125. Potamogeton perfoliatus, Linn. 
Provinces all? No authority for South Wales? Native. 
Lat. 50—61. Cornwall, Dorset, Kent. — Orkney, Shetland. 
Zones 123. Humber to 400 yards. Tyne to 200 yards. 
Census 17 34 68. Ireland 10. British type of distribution. 
Europe all, except Finmark. 
Russia 6-43.21. India. Siberia. Davuria. 
Algeria. — Faroe. Iceland. America. 
1126. Potamogeton lucens, Linn. 
Provinces 12345-7891011121314 15 -- [18]. Native. 
Lat. 50—58. Devon, Wight, Kent. — Aberdeen, Banff. 
Zones 123. Tyne to 200 yards. Humber to 150 yards. 
Census 14 28 55. Ireland 9. English-british type. 
Europe all, except Lapland and Finmark. 
Russia -- 432. Himalaya. Siberia. Davuria. 
Algeria. Azores. — Faroe. -Tccland. America. 
