Hylomecon is a genus of flowering plants in the family Papaveraceae. Its species are native to China, Korea, Japan and the Russian Far East.
Species , Plants of the World Online accepted two species: Hylomecon japonica (Thunb.) Prantl Hylomecon vernalis Maxim.
References
Christopher Grey-Wilson, Poppies (Portland: Timber Press, 2000) pp. 40–41