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Key to Catalpa

Bignoniaceae

Catalpa

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1 Flowers creamy yellow, striped inside with deeper yellow and spotted with dark violet; leaves usually lobed; upper surface of leaf blades glabrous or glabrate; seeds elliptical, 2.5-3 mm long, 8-10 mm wide; capsule 5-8 mm in diameter
1 Flowers white or pale rose, striped inside with yellow and spotted with purple; leaves rarely lobed; upper surface of leaf blades permanently soft-pubescent; seeds elongate, 4-10 mm long, 20-35 mm wide; capsule 6-15 mm in diameter.
(c) Cressler, Alan M.
  2 Corolla 2-4 cm wide, the lower corolla lobe densely spotted with purple, entire; capsule 6-10 mm in diameter, each valve 9-15 mm wide when flattened; seeds with 2 elongated wings, each wing narrowing to an acutish end, the hairs at the end appressed to one another in 2 planes, thus forming a pointed tail (like a sharply pointed paintbrush); fresh foliage with a fetid odor; leaves abruptly acuminate
(c) Fleming, Gary P.
  2 Corolla 4-6 cm wide, the lower corolla lobe sparsely spotted with purple, notched; capsule 10-15 mm in diameter, each valve 13-18 mm wide when flattened; seeds with 2 elongated wings, each wing narrowing only slightly to a rounded or oblique end, the hairs at the end appressed to one another only in one plane, thus forming a flattish fringe (like a flat paintbrush); fresh foliage essentially odorless; leaves long-acuminate