Tulipa kaufmanniana, the water lily tulip, is a species of tulip native to Central Asia. They usually have outermost petals with a different color than interior petals, and often have purple markings on their leaves. They and their hybrids are placed in Group 12, the Kaufmanniana Group, by the Royal Horticultural Society. The cultivars 'Ancilla', 'Early Harvest', 'Showwinner' and 'Stresa' have gained the Royal Horticultural Society's Award of Garden Merit. Two other Group 12 cultivars are listed ...