Article
Article
Hydrocharitales
Article By:
Cronquist, Arthur New York Botanical Garden, New York, New York.
Last reviewed:January 2020
DOI:https://doi.org/10.1036/1097-8542.328000
An order of aquatic flowering plants, division Magnoliophyta (Angiospermae), in the subclass Alismatidae of the class Liliopsida (monocotyledons). The order Hydrocharitales consists of the single family Hydrocharitaceae, with about 100 species. Within the subclass, the order is marked by its inferior, compound ovary with basically laminar placentation. The ovules are scattered over the walls of the individual carpels, which are weakly connate to form partial partitions (intruded placentas) in the ovary. The aquarium plant Vallisneria spiralis, called tape grass or eelgrass, is not a grass, but belongs to the Hydrocharitaceae. See also: Alismatidae; Liliopsida; Magnoliophyta; Plant kingdom
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