Flowering in April, before unfolding leaves, fruiting in October. Samaras 3.5–5(–7) cm long, wings spreading nearly horizontally. Flowers yellowish-green, 5-merous, usually dioecious, pedicels long and slender, sepals oblong to obovate, petals oblong to ovate, as long, or longer than sepals, stamens 8, inserted in the middle or outside the nectar disc. Inflorescence terminal, corymbose, erect, 10–30 flowered. Leaves broadly pentagonal in outline, base cordate to truncate, 5– to 7-lobed, (8–)10–25 × (5–)7–14(–16) cm, lobes apically acute or acuminate, margins remotely dentate with acuminate teeth, upper surface bright green, lower surface glossy green, glabrous except for tufts in vein axils petiole 6–20 cm long, green, glabrous, often grooved, broadest at base, exuding a milky sap when broken autumn colours yellow to purple. Buds, ovoid, with 5 to 8 pairs of imbricate scales. Branchlets glabrous, purplish-red or greenish, turning darker and woody by the end of the first year. Bark greenish-grey when young, turning darker and fissuring longitudinally with age. Maples of the WorldĪ deciduous tree to 30(–38) m. A Reunion of Trees: The Discovery of Exotic Plants and Their Introduction into North American and European Landscapes Investigation of Allelopathy in an Invasive Introduced Tree Species, Norway Maple (Acer platanoides L.) Manual of Cultivated Trees and Shrubs Hardy in North America Norway Maple makes “Most Hated Plants” List The Tree Book: Superior Selections for Landscapes, Streetscapes, and Gardens Trees and Shrubs Hardy in the British Isles, Vol 1, A–C
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