Mystery Plant

Who knows what this is? I found one singular specimen near my house. It is very strange. I stem with no leaves at the bottom. Whorled leaves? (Or perhaps what I think are leaves are part of the flowers, which are tiny and a chartreuse green. Stem is smooth and has some purplish tint to the slight vertically striped effect. It appears to be somewhat hollowish. The entire plant is about knee high. Growing in the woods in a fairly moist but not soppy spot- in the company of wood nettles, mixed deciduous and coniferous trees, rue anemone, bloodroot, various ferns, grapevine and morels.

Anyone?