A DNA barcode for land plants

By P. Hollingsworth, L. Forrest, J. Spouge, Mehrdad Hajibabaei, Sujeevan Ratnasingham, M. VAN DER BANK, Mark W. Chase, R. Cowan, David L. Erickson, A. Fazekas and 42 more. Proceedings of the National Academy of Sciences of the United States of America, 2009

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An In silico approach for the evaluation of DNA barcodes (2010, background): “Since then, other portions of DNA have been proposed as barcodes, because different DNA regions have different performances in some taxa (e.g., flowering plants [9,10]; amphibians [11]).”
Nuclear ribosomal internal transcribed spacer (ITS) region as a universal DNA barcode marker for Fungi (2012, methodology): “In plants, CO1 has limited value for differentiating species, and a two-marker system of chloroplast genes was adopted (7, 8) based on portions of the ribulose 1-5-biphosphate carboxylase/ oxygenase large subunit gene and a maturase-encoding gene from the intron of the trnK gene.”
Use of ITS2 Region as the Universal DNA Barcode for Plants and Animals (2010, neutral): “Most recently, the Plant Working Group of the Consortium for the Barcode of Life recommended a two-locus combination of rbcL + matK as a plant barcode [29].”