Genus: 1 species.
Region: Venezuela, Guyana.
Habitat: acidic blackwater.
BotanyHerb; aquatic,
Leaves: thin; ribbon-like; 30 cm long; clear midrib that has veins moving at right angles to the edge of the leaf.
Inflorescence: spathes open above the surface of the water; ± 15 cm long.
TaxonomyJasarum was discovered in 1960, but wasn't described until 1977 due to classification difficulties with regards to understanding this species; only submerged aquatic species in
Araceae endemic to South America.