3842 81. POTAMACEA. 
1120. Potamogeton trichoides, Cham. 
Prov. ---4-[6]. Native. Var. of P. pusillus; Benth. Handb. 
Lat. 52—58. Norfolk; A. M. Barnard! 
Zone 1. Low grounds. An unsatisfactory species. 
Census 1 1 2. Ireland 0. Local type of distribution ? 
Europe - ita - aus ger fra - net. 
Russia --- 38. N.B. Lombardy to Petersb. Schleswig to Hungary. 
America. 
1121 (1120). Potamogeton pusillus, Linn. 
Prov. 1 to 16-18. Native. P. “ compressus” partly included. 
Lat. 50—60. Cornwall, Wight, Kent. — Orkney ; Gillies herb. 
Zones 123. Humber to 350 yards. Tyne to 200 yards. 
Census 17 33 69. Ireland 8. British type of distribution. 
Europe all, except Turkey and Finmark. 
Russia 6-432. Himalaya. Siberia. 
Algeria. Canaries. Azores. — Faroe. Icel. Greenl. America. 
1123 (1121). Potamogeton obtusifolius, M. et K. 
Provinces 12345-2? 891011 ? 181415--[18]. Native. 
Lat. 50—57. Devon, Sussex, Kent! — Lanark! Kincardine! 
Zones 1 2. Tyne to 200 yards. 
Census 12 20 86. Ireland 5. English-british type. 
Europe - - - aus ger fra cha net den got. Sweden, very local. 
Russia --- 38. Western Siberia. N.B. The P. gramineus of 
British botanists; not so of several Continental botanists. 
1128*, Potamogeton acutifolius, Link. 
Provinces - 23 4---8-[10]. Native. 
Lat. 50—53. Dorset! Sussex! Surrey! Norfolk! Lincolo. 
Zones 1 ? Low grounds. Kent. Herts. Yorkshire? 
Census 4 5 5. Ireland 0. Germanic-english type. 
Europe - - - aus ger fra cha net den got nor. 
Russia 6 -- 3. = N.B. In Britain ,this also has occasionally been 
labelled as P. gramineus. 
