Metastelma barbigerum, commonly known as Bearded Swallow-wort, is a species of flowering plant in the dogbane family, Apocynaceae. This perennial vine is characterized by its slender, twining stems that can reach lengths of up to 2 meters, though they are often found scrambling through surrounding vegetation. The leaves are typically opposite, ovate to lanceolate in shape, and measure approximately 2-5 cm long and 1-2 cm wide. Their surface is generally smooth and a deep green, providing a subtle backdrop for the plant's more striking floral displays. The flowers of Metastelma barbigerum are small and delicate, typically borne in axillary clusters. Each flower possesses five petals, which are often reflexed or spreading, and a corona that gives the appearance of a fringe or beard, hence the common name "Bearded Swallow-wort." The corolla lobes are usually white or pale greenish-white, and the corona structures are often a contrasting color, adding visual interest. Flowering typically occurs during the warmer months, from late spring through summer. Following successful pollination, the plant produces slender, elongated follicles, which are characteristic of the Apocynaceae family. These follicles split open to release numerous small, comose seeds, adapted for wind dispersal. Metastelma barbigerum is native to a specific region of South America, primarily found in parts of Brazil. It thrives in its natural habitat within open woodlands, savannas, and along the edges of forests, often growing in sandy or well-drained soils. While not widely cultivated, its horticultural potential lies in its delicate beauty and unique floral structure, making it an interesting subject for botanical collections or specialized gardens where its specific needs for well-drained soil and adequate sunlight can be met. It is not known for significant agricultural, medicinal, or economic uses, with its primary significance being within its native ecological context and as a subject of botanical study. The plant's adaptations, such as its twining habit and wind-dispersed seeds, are typical of many vine species that compete for light and space in their natural environments.