Amaranthus crispus is an annual C4 herb (Costea and Tardif 2003), 20-60 cm, stem prostrate, much branched.
Leaves alternate, numerous, blade 0.5-1.5 cm long, egg-shaped to oblong, tip pointed to rounded, margin irregularly wavy (crisped).
Flowers inconspicuous, 0.1 cm, sepals linear, minutely bristle-tipped (use lens); inflorescences in leaf axils, 0.3-1 cm long.
Fruit dry, 1-seeded, flattened, to 0.2 cm.
Wetland status: UPL.
Frequency in NYC: Very infrequent.
Habitat: Open sites, vacant lots, especially near ports.