Stems twining clockwise. Leaves: leaflets (11 or)13–17(or 19), blades elliptic to lanceo­late, to 11.2 × 2.6 cm. Racemes to 132 cm; anthesis gradually acropetal. Pedicels to 2.8 cm. Flowers appearing with or after leaves, pleasantly scented; calyx middle lobe of abaxial lip to 4 mm; corolla azure, purple, rose, or white; banner 1.6–1.8 × 1.6–1.7 cm, reflexed at base, apex acuminate, auricles of basal callosity 1.1–1.2 mm; wings 1.4–1.5 × 0.7–0.8 cm; keel 1.4–1.5 × 0.7–0.8 cm; ovary pubescent. Legumes flattened, oblong-elliptic or oblanceolate, 12–22(–30) cm, tardily dehiscent, pubescent, endocarp readily separable from exocarp. Seeds flat, lenticular. 2n = 16.

Phenology: Flowering May–Jun.
Habitat: Abandoned home sites, wooded edges of low fields, disturbed bottomland hardwood forests, wet ground.
Elevation: 0–500 m.

Distribution

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Introduced; Ala., Ark., Fla., Ga., Ill., Ind., Ky., La., Maine, Miss., N.H., N.C., Ohio, Pa., S.C., Tenn., Va., e Asia (Japan), introduced also in South America (Argentina), Europe, Africa (South Africa).

Discussion

Wisteria floribunda is native to Japan, ranging from northern Hondo southward. It is common in moist, deciduous forests and riparian habitats, from near sea level to 1200 m. Extensively cultivated in Japan, W. floribunda is also popular in the eastern United States, where it has become invasive and naturalized in habitats similar to those in its native Japan.

Selected References

None.

Lower Taxa

None.