Hydrocharitaceae


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Hydrocharitaceae

[‚hī·drō‚kar·ə′tās·ē‚ē]
(botany)
The single family of the order Hydrocharitales, characterized by an inferior, compound ovary with laminar placentation.

Hydrocharitaceae

 

a family of monocotyledonous plants. They are grasses, wholly or partially submerged in water. The flowers are usually regular, normally trimerous, and sometimes bisexual but more often unisexual (in which case the plants are dioecious). There are three stamens or many; the gynoecia have three to six, more rarely two to 15, carpels; there is an interior ovary. The fruits are mostly berry-like and remain under water. The family comprises about 15 genera and 100 species, which inhabit fresh and marine waters of the temperate, tropical, and subtropical regions.

In the USSR there are six genera and seven species. The best known are water thyme, wild celery, water soldier, and frogbit. Some members of the family are grown in aquariums. Species of the genera Enhalus, Thalassia, and Halophila form extensive underwater thickets in places along the coasts of the Indian, Pacific, and (more rarely) Atlantic oceans. Members of the family Hydrocharitaceae have many diverse adaptations to flowering and pollination; pollination usually occurs under water in freshwater species, and more frequently above water in saltwater species.

REFERENCE

Hutchinson, J. The Families of Flowering Plants, 2nd ed., vol. 2. Oxford, 1959.

M. E. KIRPICHNIKOV

References in periodicals archive ?
This distinguishes it from the other species in the Hydrocharitaceae family.
Systematic Anatomy of Vegetative Organs of the Hydrocharitaceae.
The genera of Hydrocharitaceae in the southeastern United States.
A reappraisal of phylogenetic relationships in the monocotyledon family Hydrocharitaceae (Alismatidael.
The families with the highest number of species were Poaceae (14 taxa), Cyperaceae and Polygonaceae (seven taxa each) and Characeae, Araceae, Hydrocharitaceae, Onagraceae (four taxa each).
Geraniaceae Erodium Hamamelidaceae (b) Hamamelis, Corylopsis, Loropetalum, Hyacinthaceae Albuca Hydnoraceae Prosopanche Hydrocharitaceae Lagarosiphon Johnsoniaceae Hodgsoniola Lepuropetalaceae Lepuropetalon Loasaceae Mentzelia sect.
Ademas, se utilizaron las descripciones especificas para las especies de Characeae (Wood y Imahori 1964, 1965, Guerlesquin 1981), Azollaceae (Slocum y Robinson 1997), Hydrocharitaceae (Holm-Nielson y Haynes 1986), Potamogetanaceae (Holm-Nielson y Haynes 1986a) y Pontederiaceae (Horn 1987).
Ceratophyllaceae Ceratophyllum demersum ++ Cyperaceae Schoenoplectus tatora + + ++ Haloragaceae Mvriophyllum quitense ++ ++ + Hydrocharitaceae Elodea matthewsii + ++ Lemnaceae Lemna minor + Pontederiaceae Eichhornia crassipes + Potamogetonaceae Potamogeton illinoensis ++ ++ + P.
Evolution and adaptation of inflorescences in the Hydrocharitaceae.
In the Hydrocharitaceae the interrelationships between the inflorescence and the vegetative body are much less well defined.
In the "petaloid" families (Alismataceae, Hydrocharitaceae, etc.
toward the root apex) (Avers, 1963), whereas in Hydrocharis morsus-ranae, a member of the Hydrocharitaceae, it is at the proximal end (Cutter & Hung, 1972).