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Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Hibiscus' from the website Trees and Shrubs Online (treesandshrubsonline.
A genus of some 200 species of trees, shrubs, and herbs, inhabitants mainly of the tropics and subtropics. It belongs to a group of the Mallow family in which the carpels of the ovary are completely united and the fruit a capsule.
H. syriacus ‘Diana’ is considered to be an improvement on ‘W. R. Smith’. It is a triploid, with large, waxy, wide-opened, wavy-edged flowers, borne freely in autumn, and dark green leaves. Upright habit to about 8 ft high and 5 ft wide. Raised in the United States National Arboretum and distributed in 1963.