https://www.massey.ac.nz/about/colleges-schools-and-institutes/college-of-sciences/our-research/themes-and-research-strengths/plant-science-research/new-zealand-weeds-database/staggerweed/
Staggerweed (Stachys arvensis) is a small annual weed with lilac flowers and hairs on its square stem.
massey universitystaggerweed