1) Family alismataceae 2) Liliopsid family 3) Monocot family 4) Water-plantain family 
The water-plantains (Alismataceae) are a family of flowering plants, comprising 11 genera and between 85 and 95 species. The family has a cosmopolitan distribution, with the greatest number of species in temperate regions of the Northern Hemisphere. Most of the species are herbaceous aquatic plants growing in marshes and ponds. Most Alimataceae ar...
(from the article `Alismatales`) ...genus and species (Butomus umbellatus), is used in landscaped water gardens. The three genera of Limnocharitaceae are tropical, and some species ...
[n] - perennial or annual aquatic or marsh plants
family Alismataceae noun perennial or annual aquatic or marsh plants