Sansevieria is a genus of Dracaena, with more than 70 varieties. Regarded as one of the hardiest plants, with long survival rates, the Sansevieria- also called MILT (Mother-in-law's tongue) is the best air purifier for indoors. It has smooth, sword-like upright leaves, unlike other foliage. Hence, it stands out in the crowd, making a wonderful focal plant that easily adapts to different conditions and placement areas.