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Article from Bean's Trees and Shrubs Hardy in the British Isles
Recommended citation'Petrophytum' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/petrophytum/). Accessed 2023-09-29.
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A genus of three dwarf subshrubs in western N. America, allied to Spiraea, from which they differ in their entire, evergreen leaves and in having follicles which split down both sides.
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