Acer oblongum, common name Himalayan Maple, Evergreen Maple and Kashmir Maple, is an evergreen Asian species of maple belonging to the sandalwood family.
Acer oblongum is a medium-sized evergreen to semi-deciduous tree reaching a height of approximately 15–22 metres (49–72 ft). Unique among maples, this plant stays green all winter. The trunks are buttressed, with a smooth to wrinkled bark. Leaves are opposite, ovate-lanceolate with entire margin, with a petiole 5-12 cm long, with glaucous-green underside and dark green upperside. The young shoots are reddish bronze and finely hairy. The flowers are hermaphroditic, small and inconspicuous, about 4 mm, greenish white, gathered in hairy racemes. The fruits are represented by the typical two-winged samaras, about 2.5 cm long, wind dispersed. It has been introduced for its wood and it is sometimes cultivated in large gardens for its evergreen foliage.
Acer oblongum is widespread across central, eastern, and southeastern Asia, from Tibet and northern Pakistan east as far as Japan, including southern China, northern India, and northern Indochina.
Trees evergreen, 12 to 15 m tall. Bark smooth to wrinkled. Trunk irregularly buttressed at base. Twigs red-brown or purplish, slender. Leaves ovate-lanceolate, acuminate, 5-18 cm long, 2-8 cm wide, glabrescent, reddish when young, later dark green above, paler to glaucous beneath; nerves pinnate in 6-8 pairs; base rounded to subacute; petioles slender, 2-10 cm long. Inflorescence corymobose, pubescent on leafy terminal and lateral shoots, 5-15 cm long. Pedicels pubescent. Flowers 5-merous, 7-9 mm across, greenish-white. Sepals linear, 1-2 mm wide, acute, pubescent. Petals narrowly lanceolate, 1-2 mm wide. Stamens 8, inserted on disc. Ovary pubescent, styles free nearly to the base. Samaras glabrous, 2-3 cm long; wings veined, divergent, constricted at base; nutlets gibbous, locules white-pubescent inside.
Acer oblongum prefers humid climate of the Himalayan forests, especially along streams, at an elevation of about 600–2,000 metres (2,000–6,600 ft) above sea level.
It grows in the lower Himalayan foothills from 600 to 2000 m elevation in moist forests, especially along streams. Cultivated in gardens for its ornamental, evergreen foliage. Wood is used in making farming implements.