|Acer truncatum subsp. var.||Shantung maple, Shandong Maple|
It is a medium-sized deciduous tree growing to 15 m tall with a broad, rounded crown. The bark is smooth on young trees, becoming shallowly ridged with age. The leaves are opposite, palmately lobed with five lobes, 5-12 cm long and 7-11 cm broad, with a 3-10 cm petiole; the lobes are usually entire, but occasionally with a pair of teeth on the largest central lobe, and the margin is often wavy. The petiole bleeds a milky latex when broken. The flowers are in corymbs, yellow-green with five petals 5-7 mm long; flowering occurs in early spring. The fruit is a double samara with two winged seeds, the seeds are disc-shaped, slightly flattened, 13-18 mm across. The wings are 2 cm long, widely spread, approaching a 180° angle. The bark is greenish-grey, smooth in young trees, becoming shallowly grooved in mature.
It is closely related to, and often difficult to distinguish from, Acer amplum, Acer cappadocicum, and Acer pictum subsp. mono, which replace it further south and west in China, and in Japan. From Acer cappadocicum it is best distinguished by the shoots which turn brown by their first winter, not remaining green for several years. From Acer mono (syn. A. pictum auct. non Thunb.) it is best distinguished by the larger, thicker (less flattened) seeds. Acer truncatum is very unusual among maples in showing hypogeal germination.
A number of cultivars have been selected, including 'Akikaze Nishiki' with variegated leaves, 'Fire Dragon' with very bright autumn colour. The cultivar 'Keithsform' (Norwegian Sunset) is a hybrid between Acer truncatum and Acer platanoides (Norway Maple).
|Standard Cyclopedia of Horticulture|
Acer truncatum, Bunge. Tree, to 25 ft.: lvs. deeply 5-lobed and mostly truncate at the base, 2 1/2-4 in. across, glabrous, light green, purplish when unfolding; lobes acuminate, setosely pointed, entire or sometimes the middle ones 3-lobed: fr. with yellow, short and broad wings, spreading at right or obtuse angles. N. China. —Hardy tree, with handsome, dense foliage.CH
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