Astragalus bibullatus

Astragalus bibullatus, known as Pyne's ground-plum or pyne's milkvetch, is a critically endangered perennial legume endemic to a very restricted area of cedar glades and limestone outcrops in Rutherford County, Tennessee, USA. It is a low-growing plant bearing pinkish-purple flowers followed by inflated, balloon-like pods characteristic of many milkvetches, adapted to the sparse, rocky soils of cedar glades. The species has one of the smallest known ranges of any North American plant and is listed as federally endangered.