The fruits of Ostrya virginiana are very distinctive and provide an excellent identification feature, in one form or another, throughout the year. The fruit cluster resembles the fruit of true hops, Humulus lupulus, which is used in making beer; hence the common name of hophornbeam. The nutlets are enclosed in individual greenish, inflated sacs arranged in a cluster.
Karren Wcisel, TreeTopics.com
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Betulaceae, Ostrya virginiana, hophornbeam, American hophornbeam, ironwood, tree, deciduous