Acer caesium Wallich ex Brandis
- genus Acer L.
Trees up to 25 m tall, andromonoecious. Bark gray. Branchlets glabrous, usually glaucous; winter buds ovoid, margin ciliate. Leaves deciduous; petiole purplish green, 10-15 cm long, glabrous; leaf blade abaxially glaucous, adaxially green, 11-21 cm long, 11-14 cm wide, papery, lateral veins 7-9 pairs, distinct abaxially, base cordate, 5-lobed, rarely 3-lobed; lobes triangular, 1-1.5 cm long, margin serrulate, apex acuminate. Inflorescence terminal, corymbose; peduncles ca. 6-7 cm long. Sepals 5, yellowish green, ca. 5 mm long, 3 mm wide. Petals 5, white, oblanceolate, ca. 5 mm long, 1.5 mm wide. Stamens 8, ca. 3-5 mm long. Disk glabrous, extrastaminal. Ovary pubescent. Fruit yellowish; nutlets convex, ca. 8 mm in diameter; wing including nutlet 4-5.5 cm, wings spreading erectly.
The chromosomal number of Acer caesium is 2n = 26 (Santamour, 1988; Sandhu and Mann, 1989).
Ecology and Distribution
Flowering from May to June; fruiting in September.
Acer caesium is occurring in SE Gansu, SW Henan, W Hubei, Ningxia, S Shaanxi, Sichuan, SE Xizang, NW Yunnan of China, N India, Nepal, Pakistan.
Growing in alpine forests; 2000-3700 m.
- Acer caesium subsp. giraldii (Pax) A. E. Murray (synonym)
- Acer giraldii Pax. (synonym)