Fig. 2

Relative synonymous codon usage (RSCU) in all protein-coding genes of the 13 plastomes. The histogram from the left-hand side of each amino acid shows codon usage value within Justicia (From left to right: J. quadrifaria, J. betonica, J. lianshanica, J. mollissima, J. patentiflora, J. adhatoda, J. vagabunda, J. grossa, J. gendarussa, J. leptostachya, J. procumbens, J. latiflora and J. demissa). Codons encoding 20 amino acids and the stop codon are displayed in rectangular shapes of different colors