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Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Rhodothamnus' from the website Trees and Shrubs Online (treesandshrubsonline.
A genus of two species bearing a superficial resemblance to some lepidote rhododendrons, but more closely allied to Phyllodoce, with which it has formed an intergeneric hybrid (see × Phyllothamnus). Another close ally is Kalmiopsis of western N. America; indeed, the relationship is so close that the only species of Kalmiopsis (K. leachiana) was transferred to Rhodothamnus by the American botanist Copeland.
In the older literature R. chamaecistus was sometimes stated to occur in north-east Asia. This is the result of a confusion between it and Therorhodion redowskianum, a species closely related to, and probably not distinct from, T. camtschaticum (Rhododendron camtschaticum).