Egeria (genus)
| Egeria | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Egeria densa , stem with leaves |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Egeria | ||||||||||||
| Planch. |
Egeria (formerly Elodea ) is a three-species plant genus in the frog-bite family(Hydrocharitaceae).
features
Egeria species are perennial, herbaceous plants that live in freshwater. Rhizomes and runners are missing. The stem is erect, elongated, branched or unbranched and roots in the substrate. The leaves are diving leaves and sit in whorls of 5 or more directly on the stem. The leaf blades are all of the same color, linear and have a pointed end. The leaf base is oblique to the stem. The leaf side facing away from the stem has neither spines nor aerenchyma . The midrib does not have a series of depressions on its sides.
The inflorescences are single-flowered and sessile. The spatas are not winged. The plants are diocesan. The flowers are unisexual. The petals are white. In the male flowers, the stamens are single and the anthers are linear. In the female flowers, the ovaries are single-chambered and the 3 styles are not three-columned. The fruits are egg-shaped, smooth and burst irregularly. The seeds are spindle-shaped and sticky.
Occurrence
The natural area of Egeria includes South America with Bolivia, Brazil, Argentina, Paraguay and Uruguay. In addition, the genus was introduced in Africa, Europe, Asia, Australia and North America.
species
The three species of the genus Egeria are:
- Dense leaved waterweed ( Egeria densa Planch. ): Its home is Brazil, Uruguay and Argentina, but it is a neophyte worldwide
- Egeria heterostemon S.Koehler & CPBove : The homeland is west-central Brazil
- Egeria najas Planch. : The homeland is Brazil, Paraguay, Uruguay and Argentina.
Sources and literature
- Qingfeng Wang, Youhao Guo, Robert R. Haynes, C. Barre Hellquist: Egeria. In: Flora of China. Volume 23 ( Hydrocharitaceae ), pp. 91 and 102 ( online ).
- Christel Kasselmann : aquarium plants. Ulmer Verlag, Stuttgart 1995; 2nd, revised and expanded edition 1999, ISBN 3-8001-7454-5 , p. 276 f.
Individual evidence
- ↑ a b c d e f Rafaël Govaerts (Ed.): Egeria. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved June 19, 2018.
