This plant is native to Europe and parts of Asia and northern Africa, but it is widespread worldwide, particularly in tropical and subtropical areas due to the ease of it being introduced.It is a common weed of fields and roadsides.
This is an annual herb reaching 70 centimeters in height with an erect stem which is usually red or red-streaked green and leafy with green foliage. The oval to triangular leaves are toothed and broad, smooth on the upper surface and powdery on the undersides.
The inflorescences are powdery clusters of spherical buds. The buds do not open into typical flower blossoms but remain with the sepals covering the ovary as the fruit develops.
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