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Q. robur is phenologically and genetically very similar to Q. petrea and both species can form hybrids. However, the leaves of Q. robur have a very short stalk (3-8 mm), whereas the acorns are clustered around a long stalk. In contrast, the leaves of Q. petraea have comparably long stalks.
Q. robur: lowland or riparian forest Q. petraea: hilly terrain and low mountain ranges