HURA, the SAND BOX TREE, in botany, a genus of the monoecia monadelphia class. The male has no calix; the corolla consists of four petals; it has eight stamens, and four glandular bearded nectaria; the calix and corolla of the female are the same as in the male; the stylus is filiform; the stigma is peltated; the capsule has four valves, and but one seed. There is only one species, a native of Mexico.