Begonia . ( Of the Br. bégonia ). 1. f. perennial plant native to America, the family of the Begoniáceas, of some four decimetres of tall, with fleshy stems, leaves are large, heart-shaped, toothed, Tan above, green reddish and with nerves very outgoing by the underside, and Monoecious flowers, with peduncles long and dichotomous, without Corolla and pink calyx.