Page author: Don Knoke
Amaranthus powellii
green amaranth, Powell's amaranth

Distribution: Introduced in much of the United States; common in the Pacific Northwest

Habitat: Disturbed areas

Flowers: July - October

Origin: Introduced from the southwestern United States and Mexico

Conservation Status: Not of concern


Monoecious, erect, simple to freely-branched annual, the 1-several stems up to 2 m. tall, striate and reddish, usually glabrous below the inflorescence.


Leaves alternate, the blade lanceolate or ovate to deltoid-elliptic, 2-10 cm. long, usually glabrous, narrowed abruptly to petioles about as long.


Flowers numerous in crowded, spike-like, terminal or axillary clusters that are usually compound and up to 15 cm. long, subtended by several linear-lanceolate, spine-tipped bracts 2.5-5 mm. long; sepals somewhat unequal, those of the pistillate flowers about equal to the fruit, 2-3 mm. long, narrowly oblong, acute to obtuse; petals none; stamens usually 3; styles 3.


1-seeded capsule.

Accepted Name:
Amaranthus powellii S. Watson
Publication: Proc. Amer. Acad. Arts. 10: 347. 1875 (as Amarantus). 1875.

Synonyms & Misapplications:
Amaranthus bracteosus Uline & W.L. Bray
Amaranthus powellii S. Watson ssp. bouchonii (Thell.) Costea & Carretero [KZ99]
Amaranthus powellii S. Watson ssp. powellii [KZ99]
Atriplex retroflexus L. var. powellii (S. Watson) B. Boivin
Additional Resources:

PNW Herbaria: Specimen records of Amaranthus powellii in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Amaranthus powellii checklist entry.

E-Flora BC: Amaranthus powellii atlas page.

CalPhotos: Amaranthus powellii photos.

USDA Plants: Amaranthus powellii information.

20 photographs:
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