Axyris amaranthoides


Sp. Pl. 2: 979. 1753.

Common names: Upright axyris
Treatment appears in FNA Volume 4. Treatment on page 308. Mentioned on page 309.

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


V4 593-distribution-map.gif

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


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


Lower Taxa