The single most likely tree obtained by ML analysis of the combined molecular data in RAxML–VI–HPC. The numbers at the nodes represent bootstrap values (only values 60 and above are given). Nodes that are unsupported have been collapsed. Collection country is given if available. Key: “Navajo rugs” indicate presence (black) or absence (white) of a given node in the tree specified in the legend.* denotes taxa included in the morphological analysis; resulting tree is given in Fig. (3).