I can't see the flower or the texture of the leaves but could it be an Epimedium? Wiry delicate stems, deep shade and asymmetrical leaves with off centre stem would fit.

Forgot to mention.. it is non flowering.

Thanks, mystery solved!

Spiraea japonica invades a variety of habitats including fields, forests, stream banks and many disturbed areas. Once established, it can form dense stands which displace native vegetation and close open areas. It is native to eastern Asia and was first introduced into the United States around 1879 as an ornamental. https://www.invasive.org/browse/subinfo.cfm?sub=3076