Asclepias physocarpa (E. Mey.) Schltr.

Asclepias physocarpa (E. Mey.) Schltr.. Gomphocarpus physocarpus, commonly known as hairy balls, balloonplant, balloon cotton-bush, bishop's balls, nailhead, or swan plant, is a species of plant in the Milkweed subfamily Asclepiadoideae of the Dogbane Family (Apocynaceae), related to the milkweeds. The plant is native to southeast Africa, but it has been widely naturalised as it is often used as an ornamental plant.