The Collaborative International Dictionary of English v.0.48:

Bignonia \Big*no"ni*a\, prop. n. [Named from the Abb['e]
   Bignon.]
   1. (Bot.) A large genus of American, mostly tropical,
      climbing shrubs, having compound leaves and showy somewhat
      tubular flowers. Bignonia capreolata is the cross vine
      of the Southern United States. The trumpet creeper (also
      called the trumpet vine), with large red tubular flowers,
      was formerly considered to be of this genus, but is now
      classified as Campsis radicans.
      [1913 Webster +PJC]

   2. any member of the family Bignoniaceae, including the
      bignonia[1], catalpa, trumpet creeper, and princess
      tree. They typically have brightly colored tubular
      (trumpet-shaped) flowers.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Catalpa \Ca*tal"pa\, n. [From the language of the Indians of
   Carolina, where Catesby discovered this tree in the year
   1726.] (Bot.)
   A genus of American and East Indian trees, of which the best
   known species are the Catalpa bignonioides, a large,
   ornamental North American tree, with spotted white flowers
   and long cylindrical pods, and the Catalpa speciosa, of the
   Mississipi valley; -- called also Indian bean.
   [1913 Webster]

WordNet (r) 3.0 (2006):

catalpa
    n 1: tree of the genus Catalpa with large leaves and white
         flowers followed by long slender pods [syn: catalpa,
         Indian bean]