Glabrous or glabrescent annual forb, up to 15-100 cm (5.90 - 39.37 inch).

The floral bracts of A. hybridus are about 3-4 mm (0.12 - 0.16 inch), while the floral bracts of A. retroflexus are about 4-6 mm (0.16 - 0.23 inch) long. The sepals of A. hybridus usually have pointed tips, while the sepals of A. retroflexus have tips that are more flattened.

Cotyledons elliptical, with rounded tip, more or less petiolate. Seedlings with entire leaves, elliptical to ovate, with entire margin.

Cotyledons: Elliptical, with rounded tip, more or less petiolate.

Stems: Central stem is light green or tan-green, round in circumference, ribbed, and usually hairy. Sometimes the lower portion of this stem is hairless.

Leaves: Alternate leaves are up to 14 cm (5.51 inch) long and 7,5 cm (2.95 inch) across (excluding the petioles), becoming slightly smaller as they ascend the central stem. They are ovate or elliptic-ovate, smooth or slightly undulate along the margins, and pubescent or hairless. The lower side of each leaf has elevated pinnate veins. The uppermost leaves are smaller, lanceolate, and pubescent. This form of Slender Pigweed has predominately green foliage, although their may be red tints along the margins of the leaves and elsewhere. The petioles are quite long, causing the leaves to droop downward somewhat; they are often pubescent like the stems.

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