Fig. 1.

Sympatry and hybridization among Leucaena species in S-C Mexico. (a) Map showing the number of co-occurring species of Leucaena in 3-min grid cells. Backyard sympatry attributable to cultivation between pairs of species is common across this part of S-C Mexico (see also SI Figs. 4 and 5). Mixtures of three species are common in northern Oaxaca and southern Puebla. Higher levels of sympatry with four to six co-occurring species are found in villages on the fringes of the upper Tehuacán Valley. (b) The distribution of backyard hybrids in S-C Mexico coincides with these sympatry hotspots.