Figure 1
From: Detection of hybrids in nature: application to oaks (Quercus suber and Q. ilex)
Sampling sites. Light gray, distribution range of Quercus suber (modified from http://www.bioversityinternational.org/networks/euforgen/); dashed line, distribution range of Q. ilex; triangles, populations included in the field trial and dark gray circles, Q. ilex, Q. suber and mixed stands (see Table 1 for population code).
