Jupunba microcalyx is a species of plant of the genus Jupunba in the family Fabaceae. It is a tree native to the Amazon rainforest of Colombia, Venezuela, Peru, and northern Brazil. In Colombia it is native to Guaviare and Vaupés departments in the Guiana Shield region, also known as Guayana, in the country's southeast near the borders with Venezuela and Brazil, where it grows up to 200 meters elevation.
Three varieties are accepted.