Zephyranthes candida, known as the Fairy Lily or White Rain Lily, is a native to the Rio de la Plata region of South America including Argentina and Uruguay but also native to Paraguay and Chile. Other names: August rain lily, White zephyr lily, Peruvian swamp-lily, Zephyr flower, and Autumn zephyr lily. This is a white cultivar of a flower usually found in pink flowering forms, Candida, grows 152 mm to 254 mm (6-10 inches) tall. It's ideal for rock gardens and for tucking into groundcovers. Leaves are a deep glossy green and measure 3 mm wide. Flowers are erect in perianth white or sometimes pinkish abaxially. The leaf-like bract is 1.8 to 4 cm. They grow best in full sun to part shade and require a medium wet soil.
[source: http://en.wikipedia.org/wiki/Zephyranthes_candida]