Distribution of the cox1 intron in the Solanaceae. Intron presence is indicated by red and "+" symbols, intron absence by black and "-" symbols. Numbers to the left of plant names give the minimum estimated size of the 3' CCT (question marks indicate that exons were not sequenced). Parenthetical numbers give the number of species sampled for each genus (see Additional File 1). The tree topology is based on refs [42; 48] and Additional File 4. Tribes are labeled as in Olmstead et al .