Nymphaea 'Madame Ganna Walska' Nymphaea ‘Madame Ganna Walska’ Nymphaea ‘Madame Ganna Walska’ is a John Wood waterlily with pale lavender pink petals with darker tips in a star shape. It has mottled pads. It is viviparous. It’s date of origin is 1992. It’s parentage is unknown.