This weed appears in sun & shade & especially and in window wells. Distinctive feature is copper colored tinge at apex. The flowers are very small and at 10x magnification show either 4 or sometimes 3 part carpel. I cannot find it in any of many weed identification guides.
Hennepin County Minnesota
This looks like Virginia Copperleaf/Mercury. See links below for more information. It is generally pretty easy to pull by hand if you wish to remove it. https://weedid.missouri.edu/weedinfo.cfm?weed_id=3 https://www.illinoiswildflowers.info/weeds/plants/va_mercury.htm
That's it! Thank you very much!