Amaranthus retroflexus |
Amaranthus viridus |
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redroot amaranth, rough pigweed |
slender amaranth |
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Habit | Plants densely to moderately villous, especially in distal portions. | |
Stems | erect, 1.5–15(20) dm; simple or branched distally, green or reddish. |
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Leaves | blades ovate to rhombic-ovate, 2–15 cm, bases wedge-shaped; margins entire; flat to crisped; midveins extending to a short spine; tips acute to obtuse; petioles 2.5–8 cm. |
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Inflorescences | terminal and axillary; erect to somewhat reflexed tightly clustered panicles, green to silvery green; bracts numerous, lanceolate to awl-shaped, 3–6 mm. |
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Flowers | perianth segments similar in staminate and pistillate flowers; spoon-shaped to obovate, overlapping, reflexed with age; equal to subequal; midveins extending to a short spine; tips rounded to notched. |
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Staminate flowers | perianth segments 4–5, 2–3 mm; stamens (3)4–5. |
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Pistillate flowers | perianth segments 5; (2)2.5–3.5 mm; stigmas 3. |
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Fruits | ovoid to elliptic, 1.5–2.5 mm; smooth to rugose at bases; dehiscence usually circumscissile. |
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Seeds | lenticular; ovoid to obovoid, 1–1.3 mm, dark brown to black; shiny. |
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2n | =34. |
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Amaranthus retroflexus |
Amaranthus viridus |
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Distribution | ||
Discussion | Disturbed areas, fields, roadsides, streambanks. Flowering Jun–Sep. 0–1500 m. BW, Lava, Owy, Sisk, WV. CA, ID, NV, WA; worldwide. Exotic? See also A. hybridus. |
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Source | Flora of Oregon, volume 2, page 66 Bridget Chipman |
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Sibling taxa | ||
Web links |
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