Eesh, fantastic read. Delightfully macabre.

https://repository.si.edu/bitstream/handle/10088/22062/bae_bulletin_128_1941_14_79-137.pdf?sequence=1&isAllowed=y

The article links this 1900s ethnographic account of suicide in the Seneca/Iroquois/Huron nations. Super interesting read about the ethnobotany of this plant and the conflicts that drove tribal suicides in the 17th-19th centuries.