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Article from Bean's Trees and Shrubs Hardy in the British Isles
A genus of about fifteen species of herbaceous or shrubby plants, some of the former annual; natives of N. and C. America and of the West Indies.
Recommended citation'Iva' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/iva/). Accessed 2020-02-22.
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