Corolla papilionacea.
Vexillum, obcordatum, emarginatum, erectum, maximum.
Alæ vexillo breviores, obtusæ, semi-obcordatæ, basi denticulatæ.
Carina obtusa, compressa, longitudine et figura alarum.
Stamina filamenta decem, coalita in vaginam, supra semifissam, apice libera, æqualia, assurentia. Antheræ subrotundæ, versatiles.
Pistillum. Germen lineare, pilosum. Stylus incurvatus, glaber. Stigma simplex.
Pericarpium. Legumen pedicellatum, compressum, obtusum, mucronatum, uniloculare, dorso alatum.
Semina, plurima, compressa, reniformia.
Empalement. Cup bell-shaped, five-toothed; the three lower segments pointed, spreading; the two upper very large, obtuse, pressed to the standard.
Blossom butterfly-shaped.