OLDENLANDIA, in botany: A genus of the tetrandria monogynia class. Its characters are these: The empanelment of the flower is permanent, fitting upon the germen; the flower has four oval petals, which spread open, and four stamens, terminated by small summits; it hath a roundish germen, situated under the flower, crowned by an indented stigma; the germen afterwards turns to a globular capsule, with two cells filled with small seeds. We have but one species of this plant in the English gardens; but Linnaeus enumerates six.