Crotalaria sagittalis, known as arrowhead rattlebox or just rattlebox, is an annual wildflower native to the United States, Midwestern and Eastern states.
Rattlebox grows 6-12' tall with alternate, short-petiolate leaves and a yellow flower that yields a plump seed pod that will rattle when shaken. It is a member of the Crotalaria genus, which has 500 members commonly known as rattlepods
https://www.illinoiswildflowers.info/prairie/plantx/rattlebox.htm
http://www.missouriplants.com/Yellowalt/Crotalaria_sagittalis_page.html ...
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