Flowering in April; fruiting in September.
Acer pectinatum subsp. pectinatum is close relative of Acer pectinatum subsp. taronense, but differs from the latter in its petioles glabrous (vs. pubescent), leaves usually 5-lobed (vs. 3-lobed), abaxially slightly pubescent on veins (vs. densely rufous pubescent on veins when young).
Acer pectinatum is occurring in S Xizang, NW Yunnan of China, Bhutan, NE India, NE Myanmar, Nepal.
Trees to 8 m tall. Bark dark brown, smooth. Branchlets purplish, glabrous; winter buds purplish. Leaves deciduous; petiole purplish red, 6-7 cm, glabrous; leaf blade suborbicular, 7-10 cm long, 6-8 cm wide, 5-lobed, abaxially pubescent especially on veins, adaxially glabrous, primary veins 5, lateral veins 8 or 9 pairs, base cordate, deeply cordate; middle lobe ovate, apex caudate-acuminate, acumen ca. 1 cm; lateral lobes triangular, margin serrate, apex caudate-acuminate. Inflorescence terminal on leafy branchlets, appearing after leaves develop, racemose, 6-8 cm, 10-40-flowered. Pedicel 5-7 mm, slender, glabrous. Staminate flowers: sepals 5, purplish green, oblong, ca. 5 mm, glabrous, apex obtuse; petals 5, obovate, apex obtuse; stamens 8, ca. 2 mm, glabrous; disk glabrous, intrastaminal; ovary rudimentary. Fruit yellowish; nutlets flat, ca. 7 mm long, 4 mm wide; wing falcate, including nutlet 1.6-2.5 cm long, 6-8 mm wide, wings spreading nearly horizontally.
The chromosomal number of Acer pectinatum is 2n = 26 (Mehra, 1976).
Growing in mixed forest; 2500-3700 m.
Acer pectinatum is an Asian species of maple that is native to the Himalayas and nearby mountains in southwestern China, Myanmar, and the northeastern part of the Indian Subcontinent.[4] It is a spreading deciduous tree up to 20 m (66 ft) tall in the wild,[5] with brown bark. The leaves are non-compound, leathery, up to 10 cm wide and 8 cm across, toothless, usually with 5 lobes but sometimes 3, the lobes toothed along the edges.[4] The leaves of mature trees turn brilliant shades of yellow and orange before falling off in autumn.[5]
Acer pectinatum is an Asian species of maple that is native to the Himalayas and nearby mountains in southwestern China, Myanmar, and the northeastern part of the Indian Subcontinent. It is a spreading deciduous tree up to 20 m (66 ft) tall in the wild, with brown bark. The leaves are non-compound, leathery, up to 10 cm wide and 8 cm across, toothless, usually with 5 lobes but sometimes 3, the lobes toothed along the edges. The leaves of mature trees turn brilliant shades of yellow and orange before falling off in autumn.
