Potamogeton a sort - complex regular group which is very hardly described. This group studied much researcher. At old university worked: ZH.Zhiliber who has described 6 kinds; S.B.Jundzil, has described 10 kinds; J. Jundzil, has described 9 kinds the First special research sorts Potamogeton has made J.F.Volfgang 72 figures the Most well-known researcher sorts Potamogeton Are found it is V.Galinis. Herbarium were kept in Vilnius pedagogical university and in Botanical institute. In Vilnius pedagogical university found 511 herbarium sheets. It is found 21 kind. On the data herbarium Vitautas Galinis 10 cards spread of the fields in territory of Lithuania are made.