The South-American genus Amphiodon Huber is reinstated and circumscribed to include a single species, A. effusus. The genus is segregated from Poecilanthe and is diagnosed by a vexillary stamen that is mostly adherent to the standard claw and a septate pod with seeds that are transversally arranged. Poecilanthe ovalifolia is synonymized with A. effusus. Description, illustration, and geographical distribution for A. effusus are provided.
- South America