Silene noctiflora is an annual or winter annual herb, 20-80 cm tall, hairy, upper parts sticky, lower parts densely hairy.
Leaves opposite, lance-elliptic, 5-12 cm long, 2-4 cm wide, stem leaves stalkless, basal leaves stalked; inflorescence loosely branched, few flowered.
Flowers fragrant, petals pinkish above, yellowish at base, deeply 2-lobed, to 1 cm long above calyx, opening in evening, in-rolled during day, self-fertile (autogamous), (Mulligan and Kevan 1973), calyx tubular, inflated in fruit to 3 cm; blooming July-Sept.
Fruit a dry, 3-parted capsule, splitting open at top by 6 teeth to release seeds; seeds to 0.1 cm, wrinkled and minutely warty.
Wetland status: UPL.
Frequency in NYC: Very infrequent.
Habitat: Open areas.