BrianBay9
Masterpiece
As it turns out, ilex and suber apparently hybridize. Could be that.
www.nature.com

Detection of hybrids in nature: application to oaks (Quercus suber and Q. ilex) - Heredity
Powerful and accurate detection of first-generation (F1) hybrids and backcrosses in nature is needed to achieve a better understanding of the function and dynamics of introgression. To document the frequency of ongoing interspecific gene exchange between two Mediterranean evergreen oaks, the...
