Corydalis incisa is a biennial, spring ephemeral, 10 to 50 cm tall, branched, hairless, sap watery, initially from a spindle-shaped tuber (fusiform) about 1.2 cm long, 0.5 cm wide, roots becoming fibrous in the second year.
Leaves alternate, numerous, stalk 5-20 cm long, blade 4-12 cm long and broad, fern-like, divided several times (ternate, bi to tri-ternate).
Flowers purple, sepals small, ragged (lacerate), corolla tubular, 0.8-1.5 cm long, petal lobes converging wider and darker purple at tips; inflorescence spike-like (raceme).
Fruit green, a capsule to 1.8 cm long, exploding to disperse seeds; flowers and fruits May-June.
Wetland status: NL
Frequency in NYC: Very infrequent but aggressive in one site.
Origin: East Asia.
Habitat: Understories of floodplain forest.
Notes: Spreading rapidly and potentially crowding out native understory plants ( Atha et al. 2014).