The ‘Atlas of the Vascular Plants of Minnesota’ lists seven lambsquarter species (goosefoot family) that may be found in NW Minnesota. The common name for the plant in the photo is pale goosefoot or oak-leaved goosefoot (Chenopodium glaucum L). Pale goosefoot is common in the region but at very low densities in fields. It is a smaller plant that rarely reaches over a foot in height and is frequently observed on saline soils. It is reported to have been introduced into the US from Europe but now is distributed across much North America. In my observation, pale goosefoot is not any more difficult to control with herbicides than common lambsquarters.