Oak tree leaf guide9/19/2023 ![]() ![]() ( September 2021) ( Learn how and when to remove this template message) Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources in this section. This section needs additional citations for verification. The subgenus division supports the evolutionary diversification of oaks among two distinct clades: the Old World clade (subgenus Cerris), including oaks that diversified in Eurasia and the New World clade (subgenus Quercus), oaks that diversified mainly in the Americas. ![]()
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