Malva (mal-vuh) Mallow, High Mallow; Malvaceae Family. Hardy annuals, biennials and perennials. All have flowers in the leaf axils, pink or white and alternate leaves. Malva syvestris (sil-vess-triss); 3 foot plant with 1 inch purple rose flowers, naturalized in North America. Malva is a short-lived perennial that is often grown as a biennial. Self-seeds in optimum growing conditions.