Amaryllidaceae, having common name(s) associated with the genus; Milk Lily, Orinoco Lily, Milk and Wine Lily.
These were originally grown from a seed source in South Africa. Though this species is known for the classic milk & wine markings, you may get a pure white. Ht. 24-30 inches. Hardy in zones 6, 7, 8, 9, 10.