Fig. 3. The major lineages of hummingbirds as determined using DNA-DNA hybridization (Bleiweiss et al., 1994, 1997) and corroborated using sequences from one mitochondrial and two nuclear genes (J. A. McGuire and D. L. Altshuler, unpublished data). Mapped onto the phylogeny are the means of the midpoints of elevation ranges (from Schuchmann, 1999) for all taxa whose genera have been included in either phylogenetic analysis.