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Article from Bean's Trees and Shrubs Hardy in the British Isles
'Hypericum balearicum' from the website Trees and Shrubs Online (treesandshrubsonline.
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A remarkably distinct species of close, shrubby habit and about 2 ft high, the stems winged and more or less warted. Leaves 1⁄4 to 1⁄2 in. long, ovate or oblong, rounded at the tip, the lower side covered with curious wart-like lumps with a corresponding depression on the upper side; the margin entire, but very wavy or wrinkled. Flowers yellow, terminal and solitary, 11⁄2 in. wide, fragrant; petals narrow and fragile; stamens 1⁄2 in. long. Bot. Mag., t. 137.
Native of the Balearic Isles; introduced to Britain from Majorca in 1714. This curious plant, quite different in its warted leaves from all other cultivated hypericums, is, unfortunately, not hardy except in the warmer parts of the country. It flowers from June to September.
This sometimes attains 6 ft or so in the wild. Dr Robson makes the interesting observation that it is closely allied to the African H. revolutum.