Explanation:
Perisperm is a persistent nucellus. It is also called residual nucellus. Perisperm is surrounds and nourishes the developing embryo within the seed, but unlike the endosperm. Perisperm is typically diploid and originates from the maternal tissue of the ovule. Seed having perisperm are called perispermic seeds e.g. mirabilis Jalapa (4'o clock plant), Nymphaea, zingiber, portulaca, canna, capparis etc.