Not an accepted name (status: unknown). The accepted name is Brassica juncea (L.) Czern., 1859.

Brassica juncea var. japonica (Thunb.) L.H.Bailey, 1859 22% complete

No common name

Gentes Herbarum 1:93, t. 40. 1922

There is no corrections for Brassica juncea var. japonica yet.