Cardamine pensylvanica is an annual to biennial to 60 cm tall, stem stiffly hairy (hispid) below.
Leaves alternate, pinnate, terminal leaflet rounded, to 2 cm wide, stem leaves to 8 cm long, leaflets oval, to 0.8 cm; basal leaves few to none.
Flowers white, 4-parted, petals to 0.4 cm long.
Fruit dry, capsules linear, to 3 cm long; blooming and fruiting April-June; seeds germinating in late summer and fall.
Wetland status: OBL.
Frequency in NYC: Very infrequent.
Habitat: Wet to moist soil, pH 4.8-6.8. Cardamine species are host to the larvae of the falcate orangetip butterfly, Anthocharis midea (Pieridae). Very similar to C. hirsuta, which is much more common.