Dracaena pearsonii (Sansevieria pearsonii) is a species of Dracaena (Sansevieria) belonging to the Asparagaceae family , native to Africa . It is widespread in the areas with summer rainfall in southern Africa , in Namibia , Transvaal and Natal , also in tropical Africa, in the scrub or savanna or on the banks of the river, in dry sand or stony soil. Often forming large dense colonies .