Any of various flowering plants, including Cleome isomeris (= Isomeris arborea), Peritoma arborea, Lobelia inflata, and species of Physaria (= Lesquerella) and Paysonia.
c. 1977-1989, Donald W. (Hank) Nicol, Notes from the Naturalist, page 50,
The bladderpod (Isomeris arborea) is a pretty bush. It has loads of bright yellow flowers and the punching bag seed pods that give it its name. But, to be honest, it stinks!
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