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Key to Corylus
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40037
1 Mature involucre of the fruit 1-3 cm long, the lobes flattened and laciniate; young twigs and petioles stipitate-glandular; [section Corylus, subsection Corylus] | |