Southern Catalpa (Catalpa bignonioides)

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Southern Catalpa (Catalpa bignonioides)

A very showy tree with large creamy flowers and cordate leaves. Commonly called the Catawba or Indian Bean Tree, this southern US native is an occasional escape from cultivation. Very similar to and frequently confused with Northern Catalpa (C. speciosa), which also occasionally escapes, but Northern Catalpa has slightly larger flowers (4-6 cm broad) with a notched lower corolla lobed and Southern has smaller flowers (2-4 cm). Northern Catalpa also blooms slightly earlier (May-June vs. June in the Piedmont) and sets fruit earlier (July-Aug. vs. Oct.).

Macon Co., NC 5/12/06.

Southern Catalpa (Catalpa bignonioides) You can't reliably tell the difference between Northern and Southern Catalpa by leaf shape, though Northern is supposed to have slightly more long-pointed leaves.

The long bean-like pods are a better clue -- they're thicker in Northern (10-15 mm) than in Southern (6-10 mm).

This one was photographed in Galax, Virginia on 14 June 2003.

Macon Co., NC 5/12/06.

Southern Catalpa (Catalpa bignonioides)

Bark detail.

Macon Co., NC 5/12/06.

More information:
Bioimages
NC State Fact Sheet
Missouri Plants
USDA PLANTS database
Virginia Tech Dendrology

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Revised 6/9/06 cwcook@duke.edu

All photographs and text ©2006 by Will Cook unless otherwise indicated.