Chamaecrista nictitans is an annual herb, 30-50 cm tall.
Leaves alternate, evenly pinnate, leaflets 7-20 pairs, oblong, 0.6-1.5 cm, bristle-tipped, finer than those of C. fasciculata, gland at leaf base short-stalked, leaflets fold together when disturbed (Newcomb 1977).
Flowers yellow, somewhat irregular, to 0.8 cm wide, petals very unequal, one almost twice as long as others, stamens 5, unequal.
Fruit dry, pods flat, to 0.6 cm long, 0.4 cm wide. Seeds eaten by some birds and small mammals (Martin et al. 1951).
Wetland status: FACU-.
Frequency in NYC: Very infrequent.
Habitat: Dry, sandy soil in open, disturbed habitats.