Two new genera of Podostemaceae from the state of Minas Gerais, Brazil

Two new monotypic genera of Podostemaceae are illustrated and described: Cipoia (C. inserta) and Diamantina (D. lombardii). Both are known only from the state of Minas Gerais, Brazil, where they occur attached to rocks in the swift currents of river-rapids and waterfalls. Diamantina is the only genus of Podostemaceae that produces pollen in tetrads. Diamantina lombardii is distinguished from all other New World members of the family by its digitate leaves and prominent gynophore. Cipoia inserta is distinguished from other New World species with dyad pollen by a single stamen per flower and by the ovary and mature capsule remaining enclosed within the ruptured spathella during and after anthesis; only the stigmas and stamens project from the spathella.