Erostrate

Achenia rostrate or erostrate.

Characteristics of beak if present; differentiation is made between true beak (rostrum), an integral part of the conidium, and false beak (pseudorostrum) produced from the apical cell of the initially erostrate conidium.

Leaflets glabrous (except for trichomes in domatia in nerve axils under leaflets); anthers all short-rostrate or erostrate.

Bentham (1865) characterized the genus Phaseolus as having spirally coiled keel-petals, while the nearest genus Vigna as having erostrate or rostrate but not spirally coiled keel-petals.