HABITAT.—Prefers deep, cold swamps and low river-banks, but grows in any good soil.
NOTES.—Hardy throughout the state. Not easily transplanted. Foliage falls early in autumn.
BIGNONIACEAE
SUMMER KEY TO THE SPECIES OF CATALPA
| a. | Leaves 5-8 inches long, thick; flowers 1-1/2 inches across, prominently yellow-spotted; seeds with pointed, fringed wings at each end; branches rather crooked and straggling; bark thin, separating into thin scales on the trunk. | C. bignonioides, p. [227]. |
| aa. | Leaves 8-12 inches long, thin; flowers 2-1/2 inches across, not prominently spotted; seeds with rounded, wide-fringed wings at each end; branches not crooked and straggling; bark thick, separating into thick scales on the trunk. | C. speciosa, p. [225]. |
WINTER KEY TO THE SPECIES OF CATALPA
| a. | Fruiting capsules about 1/4 inch thick; seeds with pointed, fringed wings at each end; branches rather crooked and straggling; bark thin, separating into thin scales on the trunk. | C. bignonioides, p. [227]. |
| aa. | Fruiting capsules about 1/2 inch thick, seeds with rounded, wide-fringed wings at each end; branches not crooked and straggling; bark thick, separating into thick scales on the trunk. | C. speciosa, p. [225]. |