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Circaea lutetiana
White flowers, 2-3 mm each. What appears to be the style is somewhat long relative to the tiny flower. The flowers last for about a month and are replaced by small, bur-like parts. Enchanter's nightshade isn't particularly toxic.
Temperate woodlands' edge.
There's some confusion with this one taxonomically. There are three species, C. lutetiana, C. canadensis, and C. quadrisculata that are all pretty much the same and I think are now just grouped together as C. lutetiana.
Also, Circaea is named for the Circe, the witch of Greek mythology who appears in the Odyssey. So that's cool.