RICHARDIA  , a small genus of the nat. ord . Araceae, native in

South Africa, to which the " arum lily " belongs . They are all greenhouse herbaceous plants of handsome appearance, with thick underground stems and large, more or less fleshy, long-stalked, arrow-shaped leaves and white or yellow flower spathes . They are readily propagated by division of the shoot, also by seed . Water should be given abundantly at all times, and the soil for potting should be rich and retentive . Potting is best effected in spring, and from the end of June to the end of August they should be plunged in a sunny spot out of doors . They will not withstand frost, and should be wintered in a warm greenhouse . They flower throughout the year .