Eumachia brevipedunculata (Rubiaceae, Palicoureeae), a new species from Yunnan, China

<i>Eumachiabrevipedunculata</i> is a newly-identified species of the tribe Palicoureeae of Rubiaceae from Yunnan, China. It is morphologically similar to <i>E.straminea</i>, but differs by its smaller stipules, shorter petioles, smaller leaf blades, reduced inflorescences with shorter peduncles, axes and pedicels, longer calyx lobes, yellow-green flowers with shorter corolla tubes and shorter anthers. This species is widely found in southern Yunnan, but has long been misidentified as <i>Psychotria</i>. We clarify its taxonomic status and provide a description and illustration here.