Life and Growth Form Study of Helophytic, Hygrophytic and Euhydrophytic Plants in East and West of Mazandaran

Aquatic plants have positive and negative effects on the human and other organisms. They affect ecological progresses of water environment and provide ecological niche for different taxonomical groupes like bacteria، epiphytes and others as well. We decided to investigate them in part of north of Iran. In this investigation، at the first specimens were collected from sampling sites، e. g. stagnant water stops and irrigated farms in different seasons. Then they were identified and after that، they were devided to three groups (helophytes، hygrophytes and euhydrophytes)، acording to their habitat and water requirements. The results revealed the existence of 135 aquatic plant species that 83 species were hygrophytic، 23 species were helophytic and 29 species were euhydrophytic. Llife forms of helophytes and hygrophytes include 21. 69% helophytes، 33. 96% threophytes، 20. 75% hemicryptophytes، 16. 03% geophytes and 7. 54% phanerophytes. Growth forms of euhydrophytic plants include 17. 24% Lemnid، 13. 8% Magnopotamid، 6. 9% Nymphaeid، agnonymphaeid، Myriophyllid، Elodeid، Batrachiid and Parvopotamid as well as 3. 45% Peplid، Ceratophyllid، Hydrocharid، Parvonymphaeid، Ricciellid، Salviniid، Charid and Magnozosterid.