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{{Taxobox_begin | color = lightgreen | name = Alismatids}}
{{Taxobox_image | image = [[Image:Lemna trisulca0.jpg|250px|Lemna trisulca]] | caption = Ivy Duckweed (''Lemna trisulca'')}}
{{Taxobox_begin_placement | color = lightgreen}}
{{Taxobox_regnum_entry | taxon = [[Plant]]ae}}
{{Taxobox_divisio_entry | taxon = [[Flowering plant|Magnoliophyta]]}}
{{Taxobox_classis_entry | taxon = [[Liliopsida]]}}
{{Taxobox_ordo_entry | taxon = '''Alismatales''' <small>Dumort. ([[1829]])</small>}}
{{Taxobox_end_placement}}
{{Taxobox_section_subdivision | color = lightgreen | plural_taxon = Families}}
[[Alismataceae]]<br/>
[[Aponogetonaceae]]<br/>
[[Araceae]]<br/>
[[Butomaceae]]<br/>
[[Cymodoceaceae]]<br/>
[[Hydrocharitaceae]]<br/>
[[Juncaginaceae]]<br/>
[[Limnocharitaceae]]<br/>
[[Posidoniaceae]]<br/>
[[Potamogetonaceae]]<br/>
[[Ruppiaceae]]<br/>
[[Scheuchzeriaceae]]<br/>
[[Tofieldiaceae]]<br/>
[[Zosteraceae]]
{{Taxobox_end}}
The order '''Alismatales''' contains the alismatids, a group of [[monocotyledon]]s (class [[Liliopsida]]). The order contains about 165 genera in 14 families, with cosmopolitic distribution. Most families are comprised of [[herb]]aceous non-[[succulent]] plants. These plants are commonly found in aquatic environmments. The [[flower]]s are usually arranged in [[inflorescence]]s, and the mature seeds lack [[endosperm]].
Traditionally, the order Alismatales was restricted to contain just three families (Alismataceae, Butomaceae and Limnocharitaceae). The other families were not considered as alismatids, and were assigned to various distinct orders, but this approach produced [[polyphyletic]] groups, and so the whole group of families is now placed into a single order.
The [[Petrosaviaceae]] have been placed in this order, but their actual affinity is not so clear. The alismatids have been considered the sister group of the [[Arales]] and the latter are now included here. As a result of this merger, the Araceae became the most important family in the order, accounting alone for over 2000 species in about 100 genera. The rest of families contain together just about 500 species.
== See also ==
*[[Seagrass]]
== References ==
* [[Barthélemy Charles Joseph du Mortier|B. C. J. du Mortier]] (1829). ''Analyse des Familles de Plantes : avec l'indication des principaux genres qui s'y rattachent'', 54. Imprimerie de J. Casterman, Tournay.
* W. S. Judd, C. S. Campbell, E. A. Kellogg, P. F. Stevens, M. J. Donoghue (2002). ''Plant Systematics: A Phylogenetic Approach, 2nd edition.'' pp. 242-247 (Alismatales). Sinauer Associates, Sunderland, Massachusets. ISBN 0878934030.
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