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This narrow-leaved stem plant was introduced in the 2000's as aquarium plant, probably from Vietnam. It was first taken for the Vietnamese species Blyxa vietii. In 2014 it turned out to belong to to the genus Nechamandra, and the plant was described as a new subspecies of Nechamandra alternifolia. This submerged plant occurs in Southeast Asia in shallow, standing waters. Nechamandra is a close relative of the Vallisneria species.
Nechamandra alternifolia subsp. angustifolia forms long, upright stems with alternate, linear, about 3-5 cm long and 0,7-2 mm wide leaves. Runners at the base of the plant, comparable with those of Vallisneria, are not uncommon.
The Narrow-leaf Nechamandra is a true underwater plant, not capable to develop a terrestrial (emersed) form. It grows quite fast and is moderately demanding. Rather strong lighting and regular CO2 and nutrient supply are recommendable. As well as other stem plants, it is easily propagated by cuttings. With its long runner chains, it may also form a large stand.
With its loosely upright, narrow, light green shoots, this rarely available plant provides an interesting vertical accent in the midground to background of not too small aquariums. Without cutting back, it forms a thicket of long, flooding shoots at the water surface.
Please be aware that the submerse form of this plant could contain snails and other invertebrates.