Polygonum patulum
Polygonum patulum
Polygonum patulum Bieb.
Engl.: Bellard's smartweed.
Bot. syn.: Polygonum bellardii auct. non All.
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.