acokanthera oblongifolia (commonly known as african wintersweet, dune poison bush, hottentot's poison, poison arrow plant or wintersweet) is a plant in the family apocynaceae. it grows as an evergreen shrub or small tree up to tall. its fragrant flowers feature a white tinged pink corolla. the berries are purple when ripe. its habitat is dry forest and coastal thickets. "acokanthera oblongifolia" is used in local african medicinal treatments for snakebites, itches and internal worms. the plant has been used as arrow poison. the species is native to mozambique and south africa.