Length variation of intergenic spacer including
among species in the subfamily Thalictroideae. A. Schematic diagram of the regions surrounding the rpl32 gene in 22 sequenced species (right). In tree on left (reduced version of Figure 2), Thalictrum1 indicates Thalictrum alpinum and Thalictrum2 represents the remaining Thalictrum species. Dotted red boxes indicate the proportion of the remnant sequences from rpl32. B. Boxplot distribution of the lengths of the ndhF-trnL intergenic spacers between the subfamily Thalictroideae and other angiosperms that contain rpl32 gene (Additional file 2: Table S3).