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description
Hydrocharitaceae, the frog’s-bit family, is a fully aquatic monocot family. It consists of 18 genera with approximately 120 species (Chen et al., 2012). The family includes both fresh and marine aquatics and exhibits great diversity in form and habit.
One of the largest genera are Ottelia (some 21 species), Halophila (some 10 species), Vallisneria (6–10 species), and Elodea (5 or 6 species).
The three genera Thalassia (2 species), Enhalus (1 species), and Halophila are marine plants, and the rest grow in fresh or brackish water (Tanaka et al., 2004; Chen et al., 2012).
Genera Count
represented in egypt with Genera
Species
represented in egypt with Species
Hydrilla verticillata, the sole member of the genus Hydrilla in the family, has high concentration of many vitamins and minerals that are typically hard to obtain from plant foods, for example it contains 15% elemental calcium a dry weight basis, which is bound to carbohydrates, proteins and polyphenols.
It contains about 50-60% complete protein and high amount of lysine (Das et al., 2015).
Hydrilla is enriched with vitamin B12, calcium, fatty acid like gamma linoleic acid, zinc, selenium, vitamin C, chlorophyll and proteins (Pandi Prabha and Rajkumar, 2015)….
Usually from a chemotaxonomic viewpoint, several types of secondary metabolites have been studied in seagrasses.
The normal alkanes of several genera represented less than 0.01% dry weight but their distribution paralleled current taxonomic schemes of the genera Halodule and Syringodium distinguished from each other and even more clearly from the genera Thalassia and Halophila (Attaway et al. 1970).
Cluster analysis of high-resolution GC–MS analyses of the sterols and fatty acids of a number of species from tropical Australia also confirmed significant segregation of the genera Cymodocea and Halodule from the genera Thalassia and Enhalus (Gillan et al., 1984).
Taxonomic questions at the species level in Halophila populations of the Pacific and Australia have been approached chemically by the presence or absence of sulphated flavonoids (McMillan, 1983).
Flavonoids and phenolic acids were detected in most species of seagrass (McMillan et al., 1980), and several types of flavonoid had been isolated from seagrass….
- Elodea
- Halophila
- Ottelia
- Thalassia
- Vallisneria
location
egypt