Issued by the USSR (Russia) in 1972, this attractive three-stamp set highlights important medicinal plants used in traditional and modern herbal medicine. The series features Yellow Horned Poppy (Glaucium flavum), Butterbur (Petasites species), and Tree Aloe (Aloe arborescens). Each stamp displays finely detailed botanical artwork against bold background colors, characteristic of Soviet scientific and nature-themed issues. Denominated 1k, 2k, and 4k, the set was part of the “Medicinal Plants” series (Лекарственные растения). A desirable thematic addition for collectors of flora, medicinal herbs, and Soviet-era definitives.