Note D — THE BIRCH-TREE.
Reading edition
Generic characters. Barren flowers in a cylindrical catkin with ternate scales. Perianth none. Stamens 10 or 12. Fertile flowers in an oblong catkin, with 3-lobed, 3-flowered scales. Perianth none. Styles 2, filiform. Emit an oblong nut, deciduous, winged, 1-celled. Kernel solitary.