Description: Raphionacme splendens subs. bingeri is a caudiciform asclepiad with zig-zag shaped herbaceous annual stems up to 20 cm tall, growing from a sub-spherical tuber, up to 25 cm in diameter. This subspecies species is remarkable for its very few broader leaves ranging from ovate to elliptic, and conspicuously smaller purple flowers. It is an exceptionally beautiful species. Raphionacme splendens subs. bingeri is a geographical form of Raphionacme splendens distributed on the western part of the range, but not sufficiently differentiated from the standard R. splendens to be considered a good species in its own. R. splendens is one of the most widespread and morphologically variable taxon of the genus. Many of its geographical variant was early classified as different independent species, but nowadays all this plant are considered part of a multiform species, where each form is linked to others by populations of plants with intermediate characteristics.