Hydatellaceae

The Hydatellaceae are a small plant family in the order of the lily -like ( Nymphaeales ) within the angiosperms. The Hydatellaceae include only seven to ten species and their areas in Australia, Tasmania, New Zealand and India.

Description

The types of Hydatellaceae are annual herbaceous plants, with very short stems that reach heights of growth of only 2 to 5 cm. They live in freshwater submerged or at least partially submerged in the seabed anchored by roots. The alternate, spirally on the plant-based concentrates arranged leaves are simple, sessile, einnervig, filiform (ie without visible leaf blade ), entire and 5 to 40 mm long.

You are getrenntgeschlechtig dioecious ( dioecious ) or monoecious ( monoecious ). In most capitate inflorescences, some flowers are summarized. The functionally unisexual flowers are tiny and monodentate. Bracts absent. The male flowers contain only one fertiles stamen. The female flowers usually contain only a constant upper carpel, a stylus and a scar. Pollination is autogamous ( autogamy = self-pollination ) or over the water ( hydrophilic ).

Are formed at Trithuria or follicles or achenes at Hydatella capsule fruits. The tiny seeds contain starch.

System

The family was of U. Hamann ( at the Department of Systematic Botany, Ruhr- Universitat Bochum) 1975 in New Zealand Journal of Botany, 14: pp. 195 installed. The position of the family in the system has been misinterpreted and it was placed in the order of Poales. Molecular genetic studies and a new interpretation of the morphology make it clear that the family belongs to the order of the Nymphaeales and is at the base of the family tree of the angiosperms.

There are only one or two genera with about seven to ten species in the family of Hydatellaceae:

  • Hydatella Diels: With two species in Western Australia, one in Tasmania and type of a species in New Zealand: Hydatella australis Diels
  • Hydatella dioica D.A.Cooke
  • Hydatella filamentosa ( Rodway ) W.M.Curtis
  • Hydatella inconspicua ( Cheesm. ) Cheesm.
  • Hydatella leptogyne Diels
  • Trithuria bibracteata D.A.Cooke
  • Trithuria konkanensis Yadav: The home is India.
  • Trithuria lanterna D.A.Cooke

Today probably include all species in the genus Hydatella Diels.

The species of the family were formerly classified in the family Centrolepidaceae.

Swell

  • Original work with the family of Ulrich Hamann description ( at the Department of Systematic Botany, Ruhr- Universitat Bochum, ) 1975. Pdf ( german)
  • The Hydatellaceae in APWebsite family. (English )
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