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Article from Bean's Trees and Shrubs Hardy in the British Isles
'Rosa pisocarpa' from the website Trees and Shrubs Online (treesandshrubsonline.
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A shrub 3 to 6 ft high in the wild, sometimes taller; branches slender, unarmed or with a few straight prickles, which occur in pairs at the nodes. Leaflets five or seven, sometimes nine, oval or ovate, 1⁄2 to 15⁄8 in. long, simply and finely toothed, downy beneath. Flowers 1 in. or rather more across, with rounded, overlapping, bright rosy petals, occurring in clusters of as many as four or five, but sometimes solitary. Pedicels and receptacle glabrous. Sepals slender, slightly expanded at the apex, glandular-bristly on the back. Fruits purplish red when fully ripe, globose or ellipsoid, up to 1⁄2 in. wide; sepals persistent. Bot. Mag., t. 6857.
Native of western N. America from British Columbia to N. California. An interesting and brightly coloured rose, with small, nearly always clustered flowers. In the form figured in the Botanical Magazine the fruits are about the size of a pea, as in the type (whence pisocarpa), but they can be 1⁄2 in. or even slightly more wide.