Amaranthus retroflexus |
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redroot pigweed, rough pigweed |
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Habit | Dioecious, erect, simple to freely-branched annual 5-10 dm. tall, obviously pubescent. |
Leaves | Leaves alternate, numerous, the blade lanceolate to obovate-oblanceolate, 2.5-8 cm. long, hairy on the lower surface, narrowed abruptly to petioles about as long. |
Flowers | Flowers closely crowded in terminal and axillary, simple to compound spikes 2-10 cm. long, subtended by several lanceolate, spiny bracts 3.5-5 mm. long; sepals of the pistillate flowers spatulate to lanceolate, 2.5-4 mm. long, at lest twice as long as the ovary; petals none; stamens usually 5; styles 3. |
Fruits | 1-seeded capsule. |
Amaranthus retroflexus |
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Flowering time | July-October |
Habitat | Fields, roadsides, wastelots, and other disturbed areas. |
Distribution | Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
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Origin | Introduced from eastern and central North America |
Conservation status | Not of concern |
Sibling taxa | |
Web links |
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