Peace Lily Plant is a very popular and very rare indoor flowering houseplant. It is also an excellent air purifier plant.The botanical name of Peace Lily Plant is Spathiphyllum. Peace Lily Plant is a very popular indoor houseplant. It is a clump-growing herbaceous perennial which produces white flowers that look like the hood of a cobra. Leaves are shiny and glossy, attractive even with no spathes. Peace lilies are sturdy plants with glossy, dark green oval leaves that narrow to a point. The leaves rise directly from the soil. The long-lasting flowers start out pale green and slowly turn creamy white as they open.