Pelargonium acetosum, commonly known as the sorrel-leaved pelargonium, is a species of perennial herbaceous plant belonging to the Geraniaceae family. This species is recognized for its distinctive foliage and its native habitat within the diverse flora of South Africa. As a member of the large Pelargonium genus, it shares characteristics with its relatives but possesses unique traits that distinguish it. The sorrel-leaved pelargonium typically presents as a low-growing, spreading shrub. Its growth habit is often somewhat sprawling, with stems that can reach lengths of up to 60 centimeters, though they are generally shorter, often remaining under 30 centimeters in height. The plant's leaves are a prominent feature, lending the common name "sorrel-leaved" due to their resemblance to sorrel (Rumex spp.). These leaves are typically heart-shaped or reniform (kidney-shaped), with a somewhat fleshy texture. The leaf margins are often crenate or lobed, and the surface can be slightly hairy. The color of the leaves is usually a vibrant green. The flowers of Pelargonium acetosum are borne on slender stalks that rise above the foliage. They are typically zygomorphic, meaning they have bilateral symmetry, and are composed of five petals. The color of the petals can vary, but they are often shades of pink or white, sometimes with darker markings on the upper petals. The flowering period generally occurs during the warmer months. Following flowering, the plant may produce a schizocarp, a type of dry fruit that splits into several one-seeded segments, characteristic of the Geraniaceae family. Pelargonium acetosum is native to the Western Cape province of South Africa. It thrives in arid and semi-arid environments, commonly found in fynbos vegetation types, rocky slopes, and open, well-drained areas. Its natural habitat often experiences dry summers and winter rainfall. In cultivation, the sorrel-leaved pelargonium prefers full sun to partial shade and requires excellent drainage. It is well-suited to well-draining soil mixes, such as those used for succulents or cacti, and is drought-tolerant once established. Overwatering should be avoided to prevent root rot. It is generally hardy in Mediterranean climates and can be grown in containers or as a groundcover in suitable regions. While not widely cultivated for specific economic purposes, Pelargonium acetosum holds ornamental value for its unique foliage and delicate flowers, contributing to the biodiversity of its native region. Its adaptations to arid conditions, such as its succulent-like leaves, allow it to survive in its native environment with minimal water. The plant plays a role in its local ecosystem, providing habitat and potentially food sources for indigenous fauna. Further research into its specific ecological interactions and potential ethnobotanical uses may reveal additional significance.