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Article from Bean's Trees and Shrubs Hardy in the British Isles
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.
Recommended citation'Petrophytum' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/petrophytum/). Accessed 2019-12-10.
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