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prostrate pigweed, tumbleweed amaranth

Habit Plants glabrous.
Stems

prostrate to ascending; much branched from bases; mat-forming, 2–6(10) dm.

Leaves

blades obovate to spatulate, 1–3(4) cm;

margins entire; flat to wavy or crisped, bases wedge-shaped;

midveins extending to a short weak spine;

tips obtuse to rounded;

petioles 7–30 mm; ? ½ as long as blade.

Inflorescences

axillary clusters of flowers, green, staminate and pistillate flowers intermixed;

bracts leaf-like; narrow and thin, 1–3(4) mm.

Staminate flowers

few;

perianth segments 3(4), 1.5–2.5 mm, scarious;

stamens 3.

Pistillate flowers

perianth segments (3)4–5, unequal, 1–3 mm;

styles 3, becoming reflexed.

Fruits

ovoid to elliptic, 1.7–2.5 mm, bases smooth, rugose at tips; dehiscence circumscissile.

Seeds

lenticular, elliptic; plump, 1.1–1.7 mm, dark brown to black; shiny to somewhat dull.

2n

=32.

Amaranthus palmeri

Amaranthus blitoides

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Disturbed areas, riverbanks, dunes, fields. Flowering Jun–Sep. 50–1700 m. BR, BW, Col, ECas, Lava, Owy, Sisk. CA, ID, NV, WA; nearly worldwide. Native?

See also A. albus.

Source Flora of Oregon, volume 2, page 65
Bridget Chipman
Sibling taxa
A. albus, A. blitoides, A. californicus, A. deflexus, A. hybridus, A. hypochondriacus, A. powellii, A. retroflexus, A. viridus
A. albus, A. blitoides, A. californicus, A. deflexus, A. hybridus, A. hypochondriacus, A. powellii, A. retroflexus, A. viridus
Synonyms Amaranthus graecizans
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