A New Species of Gonolobus (Apocynaceae, Asclepiadoideae) from Peru

Abstract

Gonolobus piurensis W. D. Stevens & Arbeláez, a new species from Peru, is described and illustrated. This new species is known from a single collection prepared more than 40 years ago in a dry, west Andean valley. It is not at all similar to any previously described species from South America, but rather is morphologically closest to G. barbatus Kunth, abundant and somewhat weedy from southern Mexico to Costa Rica.