Prunus spinosa

Dense deciduous shrub to c. 4 m high; branches spiny, divaricate; young twigs and shoots pubescent, dull. Leaves obovate to oblanceolate, mostly 2–4 cm long, 1–3 cm wide, base cuneate, apex obtuse to broadly acuminate, margins crenate or serrate, glabrous or sparsely pubescent above, usually pubescent on (at least) veins below; petiole 3–10 mm long. Flowers mostly solitary (sometimes 2 or 3) on short lateral shoots, appearing before the leaves; pedicels slender, glabrous. Sepals rounded, glabrous, margins glandular; petals obovate, white. Drupe globose, 10–15 mm diam., glabrous, bluish-black, pruinose, very sour; stone subglobose, smooth or slightly wrinkled.