This attractive semi-postal pair from Indonesia’s 1966 Medicinal Plants issue features detailed botanical illustrations of Cassia alata (Ketepeng) and Barleria cristata (Kembang Ungu). Issued with a charity surcharge, these stamps reflect Indonesia’s focus on traditional herbal medicine and public health initiatives during the period. The designs are finely printed with vibrant natural colors, making the set popular among thematic collectors of flora, medicinal plants, and Asian botany. A desirable mid-20th-century issue with strong visual and thematic appeal.