Amaranthus cruentus |
Amaranthus hybridus |
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slender pigweed, slim amaranth |
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Habit | Plants mostly glabrous, villous distally when young. | |
Stems | erect, branched or not, 3–12(20) dm, green or red. |
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Leaves | blades rhombic-ovate to widely lanceolate; (2)4–12(15) cm, bases wedge-shaped; margins entire; plane; tips acute to obtuse; midveins extending to a spine; petioles 1–5(10) cm. |
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Inflorescences | terminal and axillary, tightly clustered; lax and nodding; dull green to red, villous; bracts 2–4 mm; midveins extending to a spine. |
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Flowers | perianth segments 5, mostly similar in staminate and pistillate flowers; erect, not overlapping or reflexed, linear to lance-oblong; midveins extending to spine; tips acute. |
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Staminate flowers | generally at inflorescence tips; perianth segments of nearly equal length, 2–3 mm; stamens 5. |
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Pistillate flowers | perianth segments of equal length or 1 slightly longer, 1.5–2 mm; styles 3; erect. |
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Fruits | ovoid, 1.5–2.2 mm, rugose at tips; smooth below; dehiscence circumscissile. |
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Seeds | lenticular, widely orbicular to rounded, 1–1.4 mm, red-brown to black; shiny. |
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2n | =32. |
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Amaranthus cruentus |
Amaranthus hybridus |
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Distribution | ||
Discussion | Disturbed areas, streambanks, roadsides, fields. Flowering May–Oct. 0–700 m. Casc, Owy, Sisk, WV. CA, ID, NV, WA; throughout North America; scattered worldwide. Native? Amaranthus hybridus has been known to hybridize with A. retroflexus. |
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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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