I have this pretty plant that volunteered in my semi shade moist clay wildflower garden.
It is perennial and comes back each year in a single clump but so far has not spread.
But I became concerned that it could be Purple Loosetrife -- an invasive non-native species. The flower spike seems more sparse than what I think of as Purple Loosetrife but it seems to have similar characteristics....
Can anyone confirm yeah or nay?