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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Biology and laboratory rearing of Cricotopus lebetis (Diptera: Chironomidae), a natural enemy of the aquatic weed hydrilla (Hydrocharitaceae).
The latest classification system (known as APG system: Angiosperm Phelogeny Group system), of the families and orders of the flowering plants which based largely on DNA sequences of the chloroplast, nuclear ribosomal, and mitochondrial genes, In this system the order Alismatales put in monocot clad (Fig.1) that included six orders addition to Alismatales, which included (13) family along with Hydrocharitaceae, that the Hydrilla belong to him [5].
Pollination ecology of a seagrass, Thalassia testudinum (Hydrocharitaceae), in St.
Hydrocharitaceae Elodea potamogeton h -- (Bertero) Espinosa Iridaceae Cardenanthus vargasii h x* R.C.
Abundancia, biomasa y floracion de Thalassia testudinum (Hydrocharitaceae) en el Parque Nacional Cahuita, Caribe de Costa Rica (Licenciatura's thesis).
Efecto de la radiacion solar en la desaparicion de Egeria densa (Hydrocharitaceae) desde el humedal del rio Cruces (Valdivia, Chile).
Hydrocharitaceae Hydrilla verticillata II H S (L.f.) Royle Ottelia alismoides (L.) IV H S Pers.
The genera Egeria and Hydrilla (Hydrocharitaceae) have been the focus of concern in Brazilian reservoirs due to their large biomass (Bianchini Junior et al., 2010) leading to an increase in the amount of decomposed material, which may cause the decrease in oxygen concentration (Rose and Crumpton, 1996), alteration of redox potential (Van der Putten et al., 1997), increased rates of fouling (Rooth et al., 2003), changes in biogeochemical cycles, reduction of plant diversity (Meyerson et al., 2000), increased primary productivity (Jordan et al., 1990) and changes in trophic relationships (Batzer, 1998) available in these reservoirs.
Hydrilla, hydrilla verticillata (L.f.) Royle (Hydrocharitales: Hydrocharitaceae), a submersed, leafy-stemmed vascular hydrophyte, roots in the soil of water bodies and grows upwards producing thick floating mats at the water's surface.
In Hydrocharitaceae, similar reduction is known from several genera (Cook, 1998a), and the same applies for Juncaginaceae (Haynes et al., 1998a), Najadaceae (Haynes et al., 1998b), Positloniaceae (Kuo & McComb, 1998b), Potamogetonaceae (Haynes et al., 1998c), Zannichelliaceae (Haynes et al., 1998d), and Zosteraceae (Kuo & McComb, 1998c).