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Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Stachyurus yunnanensis' from the website Trees and Shrubs Online (treesandshrubsonline.
A shrub to about 15 ft high in the wild. Leaves leathery, persisting through the winter, ovate-oblong to ovate-lanceolate, up to 5 in. long and 15⁄8 in. wide, acuminate to caudate at the apex, cuneate at the base, finely and sharply serrate, glabrous on both sides. Inflorescence 23⁄8 to 4 in. long, with about twenty flowers on peduncles up to 3⁄8 in. long, with leaves persisting at the base. Flowers yellow, with obovate petals. Style exserted.
A native of southern and western China. It is of recent introduction and nothing is yet known of its value for gardens. Also now probably in cultivation is the closely related S. obovatus (Rehd.) Hand.-Mazz (S. yunnanensis var. obovatus Rehd.) with smaller, obovate or lyre-shaped leaves and very short, few-flowered inflorescences.