RHIZOBALUS, a genus of plants, belonging to the polyandria class; and in the natural method ranking under the 23d order, Trihilatae. Of this there is only one species, viz. Pekia. The nuts are sold in the shops as American nuts; they are flat, tuberculated, and kidney-shaped, containing a kernel of the same shape, which is sweet and agreeable. Clusius gives a good figure of the nut, and Aublet has one of the whole plant.