Hydrostachys
| Hydrostachys | ||||||||||||
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Hydrostachys imbricata , illustration |
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| Systematics | ||||||||||||
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| Scientific name of the family | ||||||||||||
| Hydrostachyaceae | ||||||||||||
| Engl. | ||||||||||||
| Scientific name of the genus | ||||||||||||
| Hydrostachys | ||||||||||||
| Thouars |
Hydrostachys ( gr. "Wasserähre") is the only genus of the family of Hydrostachyaceae .
description
Hydrostachys species are usually annual or, more rarely, perennial herbaceous plants that grow submerged in fresh water . They form tubers and take root in the water bed. The submerged leaves are simple, pinnate, or compound; they often look like small fern leaves. There are small (sometimes undetectable) stipules present.
The plants are mostly dioeciously separated sexes ( dioecious ) or rarely monoecious separated sexes ( monoecious ). The small, unisexual flowers are grouped together in annual inflorescences ; they are above the surface of the water. Bloom are not available. The inconspicuous male flowers consist of only one stamen . In the female flowers are two carpels to a top permanent ovary grown. They form capsule fruits that contain many seeds.
Occurrence
The genus is distributed in Africa from Angola , DR Congo and Tanzania to KwaZulu-Natal and Madagascar .
Systematics
There are about 20 (to 30) species in the genus and therefore in the family (selection):
- Hydrostachys inaequalis rhyme.
- Hydrostachys polymorpha Klotzsch ex A.Braun
swell
- The family at the AP website. (English)
- Description of the family at DELTA. (English)
Web links
- Description in the Flora of Zimbabwe. (English)
- Entry in the Flora of Madagascar. (English)
- Entry with the GRIN. (English)