black sea red data book - Department of Biology

Synonyms: Trapa longicarpa Jank., 1961
Trapa natans Linnaeus, 1753
Common names: Bulg: Voden orekh, Julyun; Russ: Vodyanoy orekh plavayushchiy;
Ukr: Vodyany gorikh plavayuchy
Order MYRTALES
Family TRAPACEAE
Taxonomic description. An annual water plant. Submarine stem 40-150 cm long.
Leaves 3-4 cm long, 3-4.5 cm wide, floating, wide diamond-shaped, below with hairs
along veins. Petioles 3-10 cm long, cylindrical or with oblong swellings near leaf
blades. Fruit diameter 6-10 mm, with firm cover, four-cornered.
IUCN Status
World level: VU
Black Sea Regional level: VU
Subregion level: VU
Distribution, Habitat type, Critical habitats, Limiting factors. Geographic range
of species covers both Europe and Mediterranean. In stagnant or slow-flowing water.
Occurs in pure growths or mixed with other water plants.
Biology. Probably, the species has obligate self-fertilization: there is no evidence of
cross fertilization. Fruits are distributed by flowing waters, mammals and birds.
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