Agrostemma githago is an annual herb to 1 m tall, stem thinly whitish-hairy.
Leaves opposite, stalkless (sessile), blade linear to lance-shaped, to 12 cm long, 1 cm wide.
Flowers reddish, radially symmetrical, to 4 cm wide, petals 5, overlapping, widest near notched tops, calyx lobes to 4 cm long, linear, longer than petals, hairy; blooms June-Sept.
Fruit dry, hollow, a capsule, less than 2 cm.
Wetland status: UPL.
Frequency in NYC: Very infrequent.
Habitat: An agricultural weed in open soil.