Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Menziesia pentandra' from the website Trees and Shrubs Online (treesandshrubsonline.
A deciduous shrub up to 4 ft high, with an often bi- or tri-furcate mode of branching; young shoots slender, bristly. Leaves narrowly oval, tapered at both ends, margined with hairs, bristly above, less so beneath, 1 to 2 in. long, 1⁄2 to 1 in. wide; stalk about 1⁄8 in. long, bristly. Flowers nodding, a few in an umbel, each on a slender, sparsely glandular stalk 1⁄2 to 1 in. long. Corolla roundish urn-shaped, 1⁄4 in. long, dull greenish white, five-lobed. Stamens five, glabrous. Calyx five-lobed, ciliate.
Native of Japan and Sakhalin; introduced about 1905, originally named in 1867. It is one of the least attractive of the menziesias, abundantly distinct from the other Asiatic species in having only five stamens, which are glabrous.