Common Lambsquarters

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Cotyledons.  Key characteristics: narrow, light green on the upper surface and purple on the lower surface.

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Seedling.  Key characteristics: newly emerged leaves are mealy or frosty in appearance; leaf arrangement is alternate; margins on very young leaves may not possess teeth.

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Vegetative plants.  Key characteristics: stems are smooth and ridged.  Younger leaf blades have a mealy coating.  Leaf arrangement is alternate.  Lower leaves usually have some coarse teeth along the margins while upper leaves may be entire.

Infested soybean field in Knox County, Missouri.


Seed.  Seed are round, black and enclosed in a pericarp.  Size is slightly larger than 1.0 mm.

Life cycle: summer annual.