Lupinus perennis is a perennial herb 20-60 cm tall.
Leaves alternate, palmately compound, leaflets 7-11, 2-5 cm long, widest above middle oblanceolate).
Flowers usually blue, bilaterally symmetrical, pea-flower-shaped, top petal (standard) 1.2-1.6 cm long; inflorescence of racemes 10-20 cm long at top of stem.
Fruit dry, an oblong, flattened hairy pod 3-5 cm long. Seeds eaten by some birds and small mammals (Martin et al. 1951).
Wetland status: UPL.
Frequency in NYC: Very infrequent, if still extant.
Habitat: Dry, open woods, clearings.
Notes: Not marked as growing in NYC by USDA, NRCS (2006). Plant and seeds contain toxic alkaloids (Kingsbury 1964).