Leaves opposite on lower stem, alternate above, to 2 cm wide, usually wider than long, mostly palmately 3-5-lobed, stalk as long as blade.
Flowers pale blue, 4-lobed, to 0.5 cm wide, calyx hairy lobes to 0.7 cm long; inflorescences elongate, with alternate leaves, flowers single in leaf axils; blooms April-May (Hough 1983).
Fruit dry, heart-shaped, flattened capsule, to 0.3 cm wide, above old calyx, fruit stalks elongating to 1.5 cm.
Wetland status: NL.
Frequency in NYC: Very infrequent.
Habitat: Open areas, edges.