Physocarpus opulifolius (L.)Maxim. Roasaceae Distribution: North America. Austin (2004) reported it was used for gynaecological problems by the Iroquois and Menomini; and the root as an emetic by the Ojibwa; and for treating gonorrhoea, tuberculosis and as a laxative (tribes in western USA). Plants are toxic

Oakeley, Dr. Henry F. (2013). Wellcome Library notes. Link

Large medicinal doses can be toxic

In traditional herbal medicine the following notes apply to the species of this plant: A tea made from the inner bark is laxative and emetic[222, 257].

http://www.pfaf.org, https://pfaf.org/user/Plant.aspx?LatinName=Physocarpus+opulifolius