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Key to Corylus

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1 Mature involucre 1.5-3 cm long, the lobes flattened and laciniate; young twigs and petioles stipitate-glandular; [section Corylus, subsection Corylus]
1 Mature involucre 4-7 cm long, extended into a tubular beak; young twigs and petioles villous, glandless; [section Corylus, subsection Siphonochlamys]
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