Neighbour-joining tree of DNA barcode sequences for Celastrina, with specimen voucher number and country of origin at branch tips. North American samples include 79 samples represented by four haplotypes, with h03 shared among three species (n=76) and remaining three haplotypes with one sample each of C. lucia (h01) and C. neglecta (h02, h04). Voucher data is given in Suppl. material 1.