General notions on marsh plants
A little of Botany ...
The marsh plants, also called helophytes (from the greek helios, swamp, and fita) are a middle among the aquatic and the terrestrial plants. At the bottom, they have an apparatus suitable to live in marshy or swampy land, but have most of the stem and leaves emerged.
The marsh plants living along the banks of the wetlands (also called coastal belt); and have a vegetative and reproductive apparatus totally emerged, but with roots and with the lower part of the vegetative structure submerged.
Among these plants, there are both species that live with the base of the stem always submerged (as Sagittaria sagittifolia), and other more "terrestrial" that can also live on dry, as long as the roots are always in a ground full of water ( for example the Butomus umbellatus).
These plants, with the evolution, have often developed amazing survival techniques. Some may develop in a completely different way, both morphologically and physiologically, if they are under water or on wet ground: in nature this happens during the warmer months, when the basins tend to dry up.
Other species however can grow both as hydrophytes that as rizofite (terrestrial plants).
General characteristics, and habitats
The typical habitat of these plants are the banks of watercourses and lakes, marshlands, peatlands and resurgence.
Each habitat has its own characteristics, both as a type of terrain such as water quality and exposure.These habitats are so vast and different from each other that we can not make a general summary, find out all the information in the technical specifications and in the description that we have created for each plant.
If during the summer months the habitat becomes dry, some species are implementing different coping mechanisms, such as the fact of presenting aquatic species and terrestrial forms morphologically and physiologically different and sometimes (the terrestrial is reduced or sterile).
Some species (like Hippuris vulgaris), you can behave both hydrophytes (rizofite) both helophytes, others may even result both hydrophytes (rizofite) both by terrestrial plants (such as Polygonum amphibium).