Illustrated are the staminate catkin and flower of Betula papyrifera. The common names are paper and canoe birch.
L. H. Bailey Standard Cyclopedia of Horticulture (New York, New York: The MacMillan Company, 1917) volume 1, page 499
2720×3300, 1.5 MiB
844×1024, 254.0 KiB
527×640, 122.0 KiB
263×320, 40.0 KiB