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100925_003_Pterocarya x rehderiana.jpg
Long, hanging flower strings or catkins of the hybrid wing-nut tree (Pterocarya x rehderiana), a cross between the Caucasian wing-nut (P. fraxinifolia) and the Chinese wing-nut (P. stenoptera). Named after Alfred Rehder who first raised it in 1879 in the United States.