Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Rubus crataegifolius' from the website Trees and Shrubs Online (treesandshrubsonline.
An erect, deciduous shrub of stiff habit, 6 to 8 ft high, with stout biennial stems branched towards the top, grooved and armed with small scattered prickles. Leaves on the barren shoots of the year, large, palmately three- or five-lobed, 5 to 8 in. across, heart-shaped at the base, sharply and often doubly toothed, downy beneath; stalks and midrib prickly; leaves of the flowering twigs much smaller, usually three-lobed. Flowers 3⁄4 to 1 in. across; produced in clusters terminating short twigs; petals white, prettily crimped at the margins; calyx segments lanceolate, much decurved. Fruits the size of a small raspberry, red.
Native of China, Korea, and Japan. The epithet crataegifolius is only appropriate to the small leaves of the flowering twigs; on the barren, first-year stems they are more like those of a vine or maple, and in good soil are sometimes of very large size – 8 to 12 in. across.