Axyris amaranthoides

Copyright: Flora of North America Association

Stems (5–)30–90 cm. Leaf blades pale green, (1–)1.5–3 × 5–9(–10) cm. Flowers: perianth segments 3-parted, oblong to oval, apex obtuse, whitish pubescent, with both stellate and simple trichomes adaxially; staminate whitish, less than 2 mm, stamens 3; pistillate green. Utricles red or dark brown, heteromorphic, obovate or oval, 2.5–3 mm, with distal 2-lobed appendage. 2n = 18.

Phenology: Flowering summer–fall.
Habitat: Waste places
Elevation: 0-300 m

Introduced; Alta., B.C., Man., N.B., N.S., Ont., Que., Sask., Maine, Mass., Minn., Mo., Mont., N.H., N.Y., N.Dak., Eurasia.

Discussion

Axyris amaranthoides is an invasive and problematic weed, especially in crops of cereal grains. It also has been reported from Colorado and Iowa and is to be expected elsewhere.

Selected References

None.

Lower Taxa