1	Inflorescences of true terminal panicles without leaves subtending flowering branches	2
–	Inflorescences largely of racemes aggregated terminally on branches, such that the entire flowering region appears as a leafy panicle with only the occasional leaf absent at the base of a flowering branch	4
2	Inflorescence 20–30 cm long; apex of wing and keel petals obtuse; pods narrow 5–15 mm wide, not constricted between seeds; seeds 1–6, lenticular, 7–10 × 6–9 mm	3
–	Inflorescence 30–40 cm long; apex of wing and keel petals acute; pods broad 25–35 mm wide, noticeably constricted between seeds and with thickened dorsal and ventral sutures; seeds 3–6, ellipsoid or suborbicular 15–35 × 20–25 mm	W. eurybotrya
3	Leaflets oblong-ovate, apex acuminate; flowers white, nectar guides green	W. championii
–	Leaflets lanceolate or linear, apex acute; flowers red, pink or purple, nectar guides yellow	W. reticulata
4	Leaves deciduous, leaflets 9–15 narrowly ovate-lanceolate; flowers 6–12 mm long	W. japonica
–	Leaves evergreen, leaflets 5–7 broadly ovate; flowers 12–15 mm long	W. kiangsiensis