Chenopodium album

About

Chenopodium album is a fast-growing annual plant in the flowering plant family Amaranthaceae. Though cultivated in some regions, the plant is elsewhere considered a weed. Common names include lamb's quarters, melde, goosefoot, wild spinach and fat-hen, though several are also applied to other species of the genus Chenopodium, for which reason it is often distinguished as white goosefoot.

Summary from Wikipedia