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Hypericum calycinum is a species of prostrate or low-growing shrub in the flowering plant family Hypericaceae. It is native to the Strandzha Mountains along the Bulgarian and Turkish Black Sea coast. Widely cultivated for its large yellow flowers, its names as a garden plant include rose-of-Sharon in Britain and Australia, and Aaron's beard, great St-John's wort, creeping St. John's wort and Jerusalem star.
Hypericum calycinum is a low, creeping, evergreen woody shrub (classified as a subshrub or shrublet to about 1 m (3 ft 3 in) tall and 1–2 m (3 ft 3 in – 6 ft 7 in) wide but often smaller. The green, ovate leaves grow in opposite pairs. Usually 4 inches (10 cm) long, the undersides of the leaves are net-veined. In the sun, the leaves are a vibrant green color, and in shade, the leaves are a lighter yellow-green. The underside of the leaves is a blue-green color and in the fall, the leaves take on a purple color.
The flowers are 3–5 cm (1.2–2.0 in) in diameter, a rich yellow, with five petals and numerous yellow stamens. Its flowers can be described as "rose-like" and tend to be single or in units of two or three, flowering in June to September.
