The Alismataceae or water-plantain family is a family of flowering plants, comprising 11 genera and between 85-95 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. Description Most are robust perennials, but some may be annual or perennial, depending on water conditions - they're normally perennial in permanent waters, annual in… (More on Alismataceae)