Flora of the Southeastern United States
2022 Edition

Colors

Data mode

Key to Wisteria

1 Legume and ovary glabrous; pedicels 5-10 (-15) mm long; standard reflexed near the middle; seeds reniform; leaflet margins plane; leaflet apices acute to slightly acuminate; [native species of swamps and bottomland forests and thickets]
..2 Upper lip of the calyx <0.5× as long as the tube; inflorescence usually 4-15 cm long; pedicels and calyx with 0-few clavate glands
..2 Upper lip of the calyx 0.7-1.2× as long as the tube; inflorescence usually 15-30 cm long; pedicels and calyx densely clavate-glandular
1 Legume and ovary velvety pubescent; pedicels 15-20 mm long; standard reflexed at the base; seeds lenticular; leaflet margins undulate; leaflet apices mainly strongly acuminate; [introduced species, naturalized in a wide variety of situations].
....3 Standard 20-23.5 mm long, 21-23 mm wide; leaflets (7-) 9-11 (-13) per leaf; raceme to 33 cm long, with 25-95 flowers opening nearly simultaneously; vine twining clockwise (dextrorse; from lower left ascending to upper right)
....3 Standard 16-18 mm long, 16-18 mm wide; leaflets 7-17 (-19) per leaf; raceme to 132 cm long, with 25-170 flowers opening nearly simultaneously or sequentially; vine twining counter-clockwise (sinistrorse; from lower right ascending to upper left).
......4 Auricles of the standard’s callosity 1.1-1.2 mm long; leaflets (11-) 13-17 (-19) per leaf; raceme to 132 cm long, with the 50-170 flowers opening successively from base to the tip of the inflorescence, those at the base withering before those at the tip have opened
......4 Auricles of the standard’s callosity 0.7-0.8 mm long; leaflets 7-17 per leaf; racemes to 36 cm long