Acmadenia mundiana is a single-stemmed, much branched shrub that may grow taller than 1 m. It is endemic to a small area of limestone outcrops near the sea from Agulhas to the De Hoop Reserve, south of Swellendam in the Western Cape.
Buchu is a common name for a group of plants belonging to the Rutaceae (Citrus) family. The family includes the genera Acmadenia and Agathosma that comprise well-known buchu plants, widely used in traditional medicine. The most famous buchu medicine probably comes from Agathosma betulina, another Western Cape species.The Acmadenia genus is commonly known as duineboegoe in Afrikaans (dune buchu).
The flowers of A. mundiana are five-petalled and star-shaped, growing on the branch ends mainly in winter. There is a fine, dark pink line called a nectar guide, a route map enticing visiting pollinators along the centre of each petal into the throat of the flower.
The leaves are small, grey-green, oblong or elliptical and more spreading than the closely pressed to the stem leaves of some other species in the genus (Manning, 2007).