Peace Lily

The Spathiphyllum wallisii, commonly known as the Peace Lily, sends glossy dark green lance-shaped leaves straight up from the base, with pure white spathes held clear above them. In good light it flowers on and off through the year rather than in a single season.
It is the standard interior planting subject for lobbies, atria and offices, and it also mass plants well in deep shade outdoors in the tropics.
The Peace Lily flowers in shade that defeats almost everything else, which is why it has never left the interior planting list.