Spathiphyllum (a.k.a. "Peace lily"). Best viewed on black.

Spathiphyllum is a genus of about 40 species of monocotyledonous flowering plants in the family Araceae and are native to tropical regions of the Americas and southeastern Asia. Certain species of Spathiphyllum are commonly known as "Spath" or "Peace Lilies". They are evergreen herbaceous perennial plants with large leaves 12–65 cm (4.5-25.5 inches) long and 3–25 cm (1-10 inches) broad. Flowers are produced in a spadix surrounded by a 10–30 cm (4-12 inches) white, yellowish, or greenish spathe. The plant does not need large amounts of light or water to survive and several species are very popular indoor houseplants. It lives best in shade and needs little sunlight to thrive. The soil is best left moist and only needs watering if the soil is dry. The NASA Clean Air Study found that Spathiphyllum cleans indoor air of certain environmental contaminants, including benzene and formaldehyde.
(Wikipedia (edited)).