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Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Rubus lambertianus' from the website Trees and Shrubs Online (treesandshrubsonline.
A straggling sub-evergreen shrub, with slender, four-angled stems viscous when young, and armed with short decurved spines. Leaves glossy green on both surfaces, simple, sometimes three-, or obscurely five-lobed, sometimes merely wavy; broadly ovate or triangular, 3 to 5 in. long, nearly as much wide at the heart-shaped base, toothed, slightly downy on the veins above, more so beneath; stalk 1 to 2 in. long; stipules 1⁄3 in. long, with usually five linear lobes. Flowers white, 1⁄3 in. across, produced in a terminal panicle 3 to 5 in. long, calyx segments downy, ovate-lanceolate. Fruits red, small.
Native of Central China; introduced by Wilson in 1907. It is a luxuriant, very leafy, scandent shrub, suitable for planting as a rough group in thin woodland.
Synonyms
R. hakonensis Franch. & Sav.
R. lambertianus subsp. hakonensis (Franch. & Sav.) Focke
R. lambertianus var. hakonensis (Franch. & Sav.) Rehd