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]

WordNet (r) 3.0 (2006):

Bignonia capreolata
    n 1: woody flowering vine of southern United States; stems show
         a cross in transverse section [syn: cross vine, trumpet
         flower, quartervine, quarter-vine, Bignonia
         capreolata]