Description from Flora of China
Phaseoloides Duhamel; Rehsonia Stritch.
Lianas, deciduous. Winter buds ovoid; scales 3-5. Stipules present. Leaves imparipinnate; leaflet blades opposite, margin entire; stipels present. Racemes terminal, elongate, pendulous; nodes scattered on rachis, with 1 flower. Flowers 1.5-2.5 cm. Corolla standard orbicular, large, reflexed, glabrous or outside with some trichomes at base, with 2 basal calluses; wings free from keel. Stamens diadelphous; vexillary stamen distinct from other 9 or slightly connate at middle of sheath. Ovary stipitate, with trichomes, with 5-16 ovules. Legume linear to oblanceolate, leathery, convex over seeds. Seeds 1-3[or more] per legume, reniform to lenticular, without a strophiole; radicle folded.
The Japanese species Wisteria floribunda (Willdenow) Candolle is commonly cultivated as a garden plant in China.
About six species: E Asia, North America; four species (three endemic) in China.
(Authors: Wei Zhi (韦直); Les Pedley)