Pachycarpus

Pachycarpus is a genus of flowering plants in the dogbane family, Apocynaceae. The genus is native to southern Africa. Plants in this genus are commonly known as bladderpods or milkweeds, though the latter common name is shared with other genera. Pachycarpus species are perennial herbs that typically grow in grasslands and savannas. They are characterized by their fleshy, tuberous roots and their distinctive inflated seed pods, which give the genus its name. The scientific name Pachycarpus derives from Greek words meaning "thick fruit."

The flowers of Pachycarpus are typically star-shaped and can vary in color from white to purple or pink. They are often fragrant and are pollinated by insects. After pollination, the flowers develop into large, bladder-like follicles that contain numerous seeds. These seeds are often attached to silky hairs, aiding in wind dispersal. Many Pachycarpus species are important food sources for the larvae of certain butterfly species, particularly those in the danaid subfamily. The tubers of some species have been used in traditional medicine by indigenous peoples. Conservation status varies among species, with some being widespread and others rare.