Alder Flowers
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“Alnus glutinosa. A, a flowering twig; s, staminate catkins; p, pistillate catkins; B, a group of staminate flowers, enlarged; C, two pistillate flowers, enlarged.” -Bergen, 1896
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Trees: ASource
Joseph Y. Bergen, A. M. Elements of Botany (Boston, MA: Ginn & Company, 1896)
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