Chelone glabra is a perennial herb, usually unbranched, to 80 or more cm tall, erect, stem square.
Leaves opposite, lance-shaped to linear, to 15 cm long, margin toothed, stalk short or none.
Flowers white to pink-tinged, bilaterally symmetric, oblong, hooded, to 3.5 cm long, above 2-3 bracts, inflorescence of spikes to 8 cm long, blooming July- Aug.
Fruit dry, a 2-parted capsule with numerous wind-dispersed seeds (Levine 1995).
Wetland status: OBL.
Frequency in NYC: Infrequent.
Habitat: Open marshes or understory of open swamp forest.