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Article from Bean's Trees and Shrubs Hardy in the British Isles
Recommended citation
'Elsholtzia' from the website Trees and Shrubs Online (treesandshrubsonline.
A genus of about thirty species of herbs and sub-shrubs, natives of Asia for the most part but also represented in Europe (though not by woody species) and in Abyssinia. The spelling of the generic name is sometimes confused with Eschscholzia, a genus of Californian plants allied to the poppies.