Not an accepted name (status: unknown). The accepted name is Hygrophila costata Nees, 1824.

Hygrophila costata var. angustifolia Nees, 1824 4% complete

No common name

T.F.L.Nees von Esenbeck & W.Sinning, Pl. Hort. Bonn. Icon. 2: 7 (1824)

There is no corrections for Hygrophila costata var. angustifolia yet.