Starry stonewort Nitellopsis obtusa

Status Red - Endangered & Critically Endangered
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A simple water plant with whorls of narrow leaf-like branches along its length.

It is often robust and up to 60 cm long, with long, branching ‘leaves’ and tiny starry bulbils along the lower parts of the stem.


It can be found at several sites in the Norfolk Broads and one near the Severn Estuary.


It grows in water up to 6m deep in areas of limestone or chalk near the sea, thus in slightly salty water.


Classified as Endangered.

Key threats

Nutrient enrichment of the water from fertilisers is its main threat.