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Northern Catalpa
Flower/Fruit: Upright panicle of white, bell shaped flowers with
orange strips and purple spots and strips.
Leaves are simple, large ovate to ovate-oblong, from 8 to 12
inches long, are heart-shaped tropical looking without any lobes
and are yellowish green in color. Leaves are generally opposite on
large branches and often whorled in 3 on young stems. They turn an
undistinguished yellow in the fall before dropping.
Southern Catalpa
Flowers: 6 to 12" panicle of white bell shaped flowers with
two rows and ridges of yellow spots and numerous purple spots in
early summer Flowers later than C. speciosa and has more purple
color.
Leaves are simple, may be opposite or whorled (3 per node),
pinnately veined, 5 to 12 inches long , 4 to 6 inches broad, heart
shaped at the base, and have a long petiole with entire margins
and soft pubescence on the underside, which is also a lighter
green than the top surface.
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http://ohioline.osu.edu/b700/b700_66.html
Key to Catalpa Species
I. Leaves are 6-12 inches (15-301/2 cm) long with acuminate leaf
tips. Foliage has no odor when crushed. Flowers are white with
yellow-striped or brown-dotted throats. Flowers are borne in
comparatively small terminal panicles. Flowers open in June.
Catalpa speciosa-Northern Catalpa
II. Leaves are 4-8 inches (10-20 cm) long with abruptly acuminate
leaf tips. Foliage has an unpleasant odor when crushed. Flowers
are white with yellow stripes and brown dots in the throat.
Flowers are borne in many-flowered clusters and open in June and
July.
Catalpa bignonioides-Southern Catalpa
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http://www.dnr.state.oh.us/tabid/5349/default.aspx
Northern Catalpa
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between the two species of Catalpa.
Cigar-Tree/Catalpa ( Catalpa speciosa ) -apex of leaf long-acuminate;flowers
5-6cm wide, faintly purple spotted in flower.
Indian-Bean/Catalpa ( Catalpa bignonioides ) -apex of leaf
abruptly aciminate;
flowers 3-4cm wide, conspicuously purple-spotted in flower
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