Western Sycamore Maple Leaf Sycamore

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Plantanus WESTERN SYCAMORE MAPLE LEAF SYCAMORE Platanus racemosa Platanus acerifolia There are three native species of Sycamore in the United States, all closely related and similar;. Platanus occldentalis, Platanus racemosa and Platanus acerifolia. Platanus orientalis is seldom found in the United States. The leaf sketches will illustrate variations of the different species. Platanus racemosa: The Western Sycamore, Platanus acerifolia: The Maple-leaf Sycamore found on the Coast of Cali- or London Plane Tree is a fornia, characteristically hybrid tree planted as a bear the flowering heads in street tree in the Eastern racemes of three to six. and Western States. The flower heads usually ap- pear in racemes of two. This tree is often erroneously called Oriental Sycamore. Platanaceae GENUS: - Platanus SPECIES: *: :' occidentalis COMMON NAMES: Sycamore, Buttonwood, Buttonball and Plane Tree POLLEN GRAINS: Oblately flattened, 18-20 microns in diameter. Membranes of the three or four broad furrows copiously flecked with granules. Germ pore absent. The exine is thin and finely reticulate pitted. POLLINATING PERIOD: April and May DISTRIBUTION: Maine to ,Central Florida, westward to Minnesota, Nebraska, Ok- lahoma and Texas. Cultivated throughout most of the United States; especially the Eastern States and Eastern Texas. ALLERGIC IMPORTANCE: Moderately Important. The common Eastern Sycamore is one of the largest deciduous trees in the East, reaching a height of 130 feet with a trunk diameter of 14 feet. The bark is smooth and exfoliating. The leaves are alternate and palmately lobed with petioles hollow near the base. The flowers are rudimentary and inconspicuous, growing In a curious ball-shaped cluster or head. Male and female flowers are In separate heads. Platanus occidentalis (Sycamore) 64 .

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