. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 175 '1. PLATE XCIII. BUTTONWOOD. 1. A flowering branch, x 5. 2. A head of flowers with most of the flowers renaoved. 3. A staminate flower, enlarged. 4. A pistillate flower, enlarged. 5. A fruiting branch with mature leaves, x J. 6. An achene, enlarged. « .^ 7. A winter twig with two heads of fruit, x i. 8. Section of a twig sliowing a subpetiolar bud, x i. 9. Section of a twig sliowing a stipule, natural size. 10. Section of a winter twig, enlarged. X i. BUTTONWOOD. Platanus occidentalis, Linnaeus. FAMILY AND GENI
. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 175 '1. PLATE XCIII. BUTTONWOOD. 1. A flowering branch, x 5. 2. A head of flowers with most of the flowers renaoved. 3. A staminate flower, enlarged. 4. A pistillate flower, enlarged. 5. A fruiting branch with mature leaves, x J. 6. An achene, enlarged. « .^ 7. A winter twig with two heads of fruit, x i. 8. Section of a twig sliowing a subpetiolar bud, x i. 9. Section of a twig sliowing a stipule, natural size. 10. Section of a winter twig, enlarged. X i. BUTTONWOOD. Platanus occidentalis, Linnaeus. FAMILY AND GENITS DESCKIPTION—The Plane Tree family, Platanaceae, comprises only 1 genus, Platanus, with about 7 species, 8 ol: which are native to the United States and 1 to Pennsylvania. In addition to the 1 species native to this State, the Old World Plane Tree (Platanus orientalls L.) is very commonly planted as a shade tree in the eastern states. FORM—Usually attains a hflght of 70-125 ft., but may roach a hoiglit of 140-170 ft. with a diameter of feet. It is the most massive of the deciduous trees of North America. Trunk usually branches near the base into heavy sub-trunks, which sub-divide and form a very deep, wide-spreading, rather open, and irregular crown. BARK—On old trunks rather thick, rigid, roughened by sl-allow fissures separating broad ridges which peel off intc thin dark brown scales. On j-ouug trunks and upper parts of old ones it peels off spontaneously into large thin plates exposing a whitish, yellowish, or a greenish inner bark. This mottled inner bark is characteristic, but rarely found near the ground. See Fig. 57. TWIGS—Rather stout, zigzag, at first green and pubescent, later brownish to gray and gmooth, decurrently ridged, enlarged at the nodes, marked by numerous, small, pale lenticels, encircled by stipule-scars. Pith wide and white. BUDS—Alternate; terminal bud absent; sub-petiolar, surrounded by base of leaf-stalk or leaf- scars, J-J of an in
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