Cardamine bulbosa is an annual or perennial to 45 cm, elongating as flowers and fruit develop to 60 cm, stems 1 to a few, from a short, stout rhizome.
Leaves alternate, simple, basal leaves round to heart-shaped about as wide as long, long-stalked, usually dying before plant flowers, stem leaves 4-8, rounded to narrow, the upper ones often stalkless.
Flowers white, petals to 1.6 cm long, sepals turning yellow, blooming April-June.
Fruit a dry, linear capsule, to 2.5 cm long, beak 0.4 cm, seeds oval.
Wetland status: OBL.
Frequency in NYC: Very infrequent.
Habitat: Moist to wet woods, shallow water. Soil pH 5.0-6.8, found in soil pH 6.2 (Gargiullo unpublished data). Cardamine species are host to the larvae of the falcate orangetip butterfly, Anthocharis midea (Pieridae).