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FOC | Family List | FOC Vol. 11 | Aceraceae | Acer

48. Acer buergerianum Miquel, Ann. Mus. Bot. Lugduno-Batavi. 2: 88. 1865.

三角枫 san jiao feng

Trees 5-20 m tall, andromonoecious. Bark rough. Branchlets slender; winter buds brown, ellipsoidal, small, scales villous along margin. Leaves deciduous; petiole 2.5-5(-8) cm, glabrous; leaf blade abaxially whitish, ovate, obovate, elliptic, or orbicular, (3-)6-10 × (3-)4-6 cm, membranous, abaxially glaucous, slightly pubescent especially on veins, adaxially glabrous, primary veins 3, base rounded or cuneate, shallowly or deeply 3-lobed, occasionally entire; middle lobe triangular-ovate or lanceolate, apex acute or shortly acuminate; lateral lobes short, margin usually entire, rarely with a few serrations, apex acute, sometimes lobes very small or obsolete. Inflorescence terminal, corymbose, ca. 3 cm wide, pubescent, numerous flowered. Pedicel 5-10 mm. Sepals 5, ovate, glabrous. Petals 5, yellowish white, narrowly lanceolate or spatulate-lanceolate, ca. 2 mm, apex obtuse. Stamens 8. Disk glabrous, extrastaminal. Ovary densely yellowish villous; style glabrous, very short; stigmas widely spreading or recurved. Fruit yellowish brown; nutlets strongly convex, 6-7 mm in diam.; wing broad at middle, contracted at base, wings spreading variously. Fl. Apr, fr. Aug.

Forests; sea level to 1500 m. Anhui, Fujian, Gansu, Guangdong, Guizhou, Henan, Hubei, Hunan, Jiangsu, Jiangxi, S Shaanxi, Shandong, Sichuan, Taiwan, Zhejiang [Japan].

1 Leaf blade orbicular, deeply 3-lobed; samara 1.5-2 cm, spreading at obtuse angle   (2)
+ Leaf blade ovate, shallowly 3-lobed, rarely unlobed, samara 2-2.5(-3) cm   (3)
2 (1) Leaf blade 4-6 × 4-6 cm, lobes nearly lanceolate; samara 1.8-2 cm.   48e var. kaiscianense
+ Leaf blade ca. 3 × 3 cm, lobes ovate; samara 1.5-1.8 cm.   48f var. yentangense
3 (1) Wings spreading at acute to right angle, rarely at obtuse angle   (4)
+ Samara wings spreading at obtuse angle or nearly horizontally   (5)
4 (3) Samara wings spreading at acute to obtuse angle, never inflexed.   48a var. buergerianum
+ Samara wings inflexed.   48b var. jiujiangense
5 (3) Samara 2-2.5 cm, spreading horizontally   48c var. horizontale
+ Samara 2.5-3 cm, spreading at obtuse angle, rarely horizontally.   48d var. formosanum

Lower Taxa


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