Amaranthus wrightii is a mostly glabrous plant growing tall. The erect or ascending stems are tinged with white or red. The rhombic-ovate to
lanceolate leaves are long and wide, with
petioles slightly shorter than the leaves. The base of the leaves are acute, the leaf margins are entire, and the apex of the leaves are obtuse. The terminal and
axillary
inflorescences are short and thick, and reddish-green. The linear-lanceolate
bracts are twice as long as the
tepals. The
pistillate flowers have five
tepals and are wide. The
staminate flowers also have five tepals and grow at the tips of inflorescences. The
utricles are wide. The dark reddish to black seeds are wide and
lenticular. The plant flowers from summer into fall. ==References==