Polygonum erectum
Polygonum erectum
Polygonum erectum L.
Engl.: erect knotweed, Russian knotgrass, bird knotgrass, bird weed, erect knot grass, goose grass.
A herbal distance course
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.