I could be making a false association but this really looks like a trillium that kept growing leaves instead of a flower

Edit: nope, extra whorls are a known thing https://www.jstor.org/stable/2990062?seq=34

Trillium plant likely infected with a phytoplasma vector. Note the presence of four pedals with a green stripe running down the center of one white pedal.

https://www.indefenseofplants.com/blog/2021/5/28/when-trillium-flowers-go-green

Trillium plant likely infected by a phytoplasma vector. Note the presence of six white pedals plus additional "pedal-like" structures surrounding the stamen and pistil. The flower has three normal shaped stamen however three stamen are replaced with “anther-like” structures which are affixed to the “pedal-like” structures described above. Note the faint green stripes on two of the pedals.

https://www.indefenseofplants.com/blog/2021/5/28/when-trillium-flowers-go-green