Polygonum arifolium
Polygonum arifolium
Polygonum arifolium L.
Engl.: halberdleaf tearthumb, halbert-leaved tear-thumb, hastate knotgrass, sickle grass.
Bot. syn.: Tracaulon arifolium (L.) Raf.
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.