Parietaria pensylvanica is an annual herb, finely hairy, 10-40 cm tall, stem somewhat translucent, pale green.
Leaves alternate, stalk thin, often pinkish, translucent; blade lance-shaped 3-8 cm long, tip tapered to rounded tip, base wedge-shaped, 3-veined from above base, margin entire.
Flowers green, tiny, amid linear bracts about 0.5 cm long, in mid to upper leaf axils.
Fruit dry, 1-seeded, shiny, about 0.1 cm long.
Wetland status: FACU-.
Frequency in NYC: Very infrequent.
Habitat: Dry woods, moist banks. Found in moist soil under a park bench.