E-Flora BC: Electronic Atlas of the Flora of British Columbia

Amaranthus retroflexus L.
rough pigweed (redroot amaranth)
Amaranthaceae (Amaranth family)

Introduction to Vascular Plants

© Paul Handford  Email the photographer   (Photo ID #68367)

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Distribution of Amaranthus retroflexus
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Species Information

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General:
Annual herb; stems 50-100 cm tall, simple to freely branched, long-hairy with dandruff-like scales below the flowers.
Leaves:
Alternate or opposite, leaf blades 3-8 cm long, hairy below, at least along the veins, narrowed abruptly to the stalks.
Flowers:
Inflorescence in terminal and axillary spikes; bracts long and needle-shaped or spiny; stamens usually 5, sometimes 4.
Fruits:
Capsules opening along an "equator", the top coming off like a lid, 1-seeded; seeds 1 mm long, rounded and convex.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to dry fields, disturbed areas and waste places in the lowland, steppe and montane zones; frequent in S BC, rare northward; throughout N. America and the Old World.

Source: The Illustrated Flora of British Columbia

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Amaranthus retroflexus var. salicifolius I.M. Johnst.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References