Native to (or naturalized in) Oregon:
- Broadleaf deciduous tree, 30-40 ft (9-12 m), irregular, short crooked branches, coarse. Leaves whorled or opposite, simple, large, 10-20 cm x 7.5-20 cm, ovate to ovate-oblong, apex abruptly acuminate, base truncate to subcordate, margin entire, nearly glabrous above, slightly pubescent below, especially on the veins. Flowers in large, upright terminal panicles, 20-25 cm long, blooms later than C. speciosa, flowers white tube-shaped, each with 2 ridges and 2 rows of yellow spots and numerous purple-brown spots. Fruit is a long, narrow green, finally brown, pod, to 35 cm or more long and about 0.7 cm wide, thin-walled, persist in winter and spring and contains numerous oblong, winged seeds.
- Sun and partial shade.
- Hardy to USDA Zone 5 Native to Georgia, Florida, Alabama, and Mississippi.
This species is smaller but similar to C. speciosa and several authors list the following as means to separate the two:
C. bignonioides relative to C. speciosa
- flowers later (about 2 weeks)
- more flowers per cluster
- leaves abruptly acuminate
- leaves give an unpleasant odor when crushed (C. speciosa scentless)
- fruit width less than 1 cm and fruit wall thinner
- trunk bark thin (not thick and ridged)
- bignonioides: like (-oides) Bignonia. It was once classified with the trumpet vine, formally Bignonia radicans and now Campsis radicans.
- Silverton, Oregon: The Oregon Garden,
- Portland, Oregon: Hoyt Arboretum