One of 25 equally most-parsimonious trees resulted from the analyses of four concatenated plastid markers (trnL-F, trnG-trnS, rpl2-trnH and rpl20-rps12; 47 OTUs, tree length = 182, consistency index (CI) = 0·87, rescaled consistency index (RC) = 0·81; homoplasy index (HI) = 0·12 and retention index (RI) = 0·9256). The clade coding and classification follow Fig. 3. An asterisk (*) after the species name indicates samples from Vancouver Island (JC385 and JC387), while ^ indicates samples from Haida Gwaii (2010-42; Supplementary Data Table S1).