Alismataceae

Alismataceae
File:Sagittaria latifolia (flowers).jpg
Sagittaria sagittifolia
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Monocots
Order:	Alismatales
Family:	Alismataceae Vent.
Type genus
Alisma L.
Genera
See text
File:Map-Alismataceae.PNG
Alismataceae distribution map

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.

Description

Most Alimataceae are robust perennials, but some may be annual or perennial, depending on water conditions — they are normally perennial in permanent waters, annual in more seasonal conditions but there are exceptions. The stems are corm-like or stoloniferous. Juvenile and submerse leaves are often linear, whilst more mature and emerse leaves can be linear to ovate or even sagittate. Most have a distinct petiole, with a sheathed base.

The inflorescence is usually compound with whorls of branches, though some are umbel-like, and others have solitary flowers. The flowers are regular, bisexual or unisexual. There are three sepals which usually persist in the fruit. Three petals, usually conspicuous, white, pink, purple, occasionally with yellow or purple spots. The petals rarely last more than one day. In Burnatia and Wiesneria the petals are minute and even occasionally absent in female flowers. Stamens are 3, 6, 9 or numerous. The ovary is superior, comprising 3 - numerous free carpels in one whorl or in a clustered head. Each carpel contains 1 (-2) anatropous ovules.

Fruit is a head of nutlets (except in Damasonium). The seeds have no endosperm and a curved or folded embryo.

Classification

Under the APG III system, the Alismataceae includes three genera formerly members of the Limnocharitaceae. Altogether, there are 17 extant genera and two fossil genera assigned to the Alismataceae:

Albidella Pichon Alisma L. Alismaticarpum † Collinson Astonia S.W.L.Jacobs Baldellia Parl. Burnatia Micheli Butomopsis Kunth Caldesia Parl. Damasonium Mill. Echinodorus Rich. ex Engelm.

Helanthium (Benth. & Hook. f.) Engelm. ex J.G. Sm. Hydrocleys Rich. Limnocharis Bonpl. Limnophyton Miq. Luronium Raf. Ranalisma Stapf Sagisma † Nikitin Sagittaria L. Wiesneria Micheli

Cultivation and uses

File:Echinodorus isthmicus2.jpg

Echinodorus isthmicus

Several species, notably in the genus Sagittaria, have edible rhizomes, grown for both human food and animal fodder in southern and eastern Asia. They were eaten as food by the indigenous peoples of North America. Most have value as food for wildlife. Some are grown as ornamental plants in bog gardens, ponds and aquariums. Limnocharis flava's leaves and flower buds are eaten in Southeast Asia as "poor people's vegetable".

References

• Neotropical Alismataceae

External links

Media related to at Wikimedia Commons Data related to Alismataceae at Wikispecies