RUIZIA, in botany: A genus of the polyandria order, belonging to the monodelphia class of plants; and in the natural method ranking under the 37th order, Columnifera. The calyx is double; the external are triphyllous; the internal are parted into five. The corolla consists of five petals, inclining to the right hand side, and adhering to the stamens, which are from 30 to 40. It has ten styli, and as many capsules. These are compressed and membranous. In each capsule are two seeds. There are four species, viz. 1. Cordata; 2. Lobata; 3. Palmata; 4. Lacinata, all natives of Asia and the Cape of Good Hope.