Amaranthus hybridus |
Amaranthus powellii |
|
---|---|---|
slender pigweed, slim amaranth |
Powell's amaranth |
|
Habit | Plants mostly glabrous, villous distally when young. | Plants mostly glabrous, occasionally villous near tips. |
Stems | erect, branched or not, 3–12(20) dm, green or red. |
erect, branched or not, 2.5–15(20) dm, green or reddish purple. |
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. |
blades rhombic-ovate to broadly lanceolate, 3–6(8) cm, bases wedge-shaped; margins entire; flat to undulate; midveins extending to a short spine; tips obtuse to cuneate; petioles ? blade, 3–6 cm. |
Inflorescences | terminal and axillary, tightly clustered; lax and nodding; dull green to red, villous; bracts 2–4 mm; midveins extending to a spine. |
mostly terminal, sometimes axillary; rigid-erect panicles with few branches, green to pale green; bracts numerous, lanceolate to awl-shaped, 4–7 mm. |
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. |
perianth segments 3–5, similar in staminate and pistillate flowers; erect, not overlapping or reflexed, broadly linear to lanceolate; midveins extending to a spine; tips acute. |
Staminate flowers | generally at inflorescence tips; perianth segments of nearly equal length, 2–3 mm; stamens 5. |
perianth segments unequal to subequal, generally at tips of inflorescences; stamens 3–5. |
Pistillate flowers | perianth segments of equal length or 1 slightly longer, 1.5–2 mm; styles 3; erect. |
perianth segments 1.5–3.5 mm; styles 3, spreading. |
Fruits | ovoid, 1.5–2.2 mm, rugose at tips; smooth below; dehiscence circumscissile. |
subglobose to ovoid, 2–3 mm; smooth to slightly rugose at tips; dehiscence circumscissile. |
Seeds | lenticular, widely orbicular to rounded, 1–1.4 mm, red-brown to black; shiny. |
subglobose to lenticular, 1–1.4 mm; black; shiny. |
2n | =32. |
=32, 34. |
Amaranthus hybridus |
Amaranthus powellii |
|
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. |
Fields, disturbed areas, roadsides, streambanks. Flowering Jun–Oct. 50–1900 m. BR, Casc, Col, CR, ECas, Lava, Owy, Sisk, WV. CA, ID, NV, WA; nearly worldwide. Native. |
Source | Flora of Oregon, volume 2, page 66 Bridget Chipman |
Flora of Oregon, volume 2, page 66 Bridget Chipman |
Sibling taxa | ||
Web links |
|
|