Barclaya hirta is a species of aquatic plant endemic to Sumatra, Indonesia.
Barclaya hirta is an aquatic plant with villous, stoloniferous, slim, 2âÂÂ5 cm long, and 0.5âÂÂ1 cm wide rhizomes. The 10-15 petiolate, rounded to ovate leaves with an obtuse apex are 5âÂÂ10 cm long, and 4âÂÂ8 cm wide. The petioles are 5âÂÂ20 cm long. The leaves exhibit brownish pubescence.
The nocturnal, 4 cm wide flower is attached to a 5âÂÂ20 cm long peduncle. The outer tepals are 2.5âÂÂ3 cm long, and the 6-8 inner tepals are 2 cm long. The androecium consists of 30-40 stamens. The stigmatic cup has 7-9 carpellary appendages. Fruits were not observed.
The diploid chromosome count is 2n = 36.
It can reproduce vegetatively through the formation of stolons.
The flowers are likely nocturnal.
It was first described as Nymphaea hirta Kurz ex Teijsm. & Binn. by Wilhelm Sulpiz Kurz but validly published by Johannes Elias Teijsmann and Simon Binnendijk in 1864. Later, it was transferred to the genus Barclaya Wall. as Barclaya hirta (Kurz ex Teijsm. & Binn.) Miq. by Friedrich Anton Wilhelm Miquel in 1870. The type specimen was collected by Johannes Elias Teijsmann in Sumatra, Indonesia.
The specific epithet hirta, from the Latin hirtus, means hairy.
It is classified as data deficient (DD) under the IUCN criteria.
It occurs in small streams.