It is a Lamb's Quarters.

Scientific name: Chenopodium album.

A herbaceous annual plant with simple, alternate leaves that are somewhat triangular and toothed. The leaves are covered with a whitish, mealy coating. Stems are upright and often multi-branched and may occasionally have a reddish tint. The plant can grow up to about 1.5 meters in height..

Lamb's Quarters leaves are edible and were historically used as a food source by indigenous peoples across its range..

The shape of the leaves and the white powdery coating are characteristic of Lamb's Quarters. The plant is typically found in disturbed areas, like the rocky setting depicted in the image.