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	Amaranthus species - A current and emerging threat in Wyoming
	Publication #: B-1299R2026 Date Published: 04/08/2026 Publication Author(s): Kelsey Brock Daniel R. Tekiela Gustavo Sbatella

Description:
The genus Amaranthus comprises more than 90 species worldwide, 38 of which are known to occur in North America. This group, often known simply as amaranths or “pigweeds,” includes herbaceous species that are both native and non-native within the United States, with around a dozen considered to be serious agricultural weeds around the world. While Amaranthus species inhabit a wide range of habitats, including natural and human-disturbed areas, the weedy species of concern primarily impact cultivated lands. Weedy Amaranthus species have a long history of association with crop production and can cause significant damage, with many having evolved resistance to herbicides. However, not all Amaranthus species are weeds; some are cultivated for beneficial purposes, such as for their edible seeds or as leaf-vegetable crops or dyes, and many were historically significant food sources for Native American tribes.

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