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13. Acer sect. Trifoliata Pax, Bot. Jahrb. Syst. 6: 326. 1885.
三小叶枫组 san xiao ye feng zu
Trees or shrubs; bark sometimes exfoliating. Leaves trifoliolate, margins subentire to coarsely serrate. Bud scales 11-15-paired. Inflorescence terminal and axillary, corymbose. Flowers 5(or 6)-merous. Stamens 10-13. Disk extrastaminal. Nutlets spherically convex; parthenocarpic tendency strong.
Five species: E Asia; five species (two endemic) in China.
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| 1 |
Bark yellow-brown, orange-brown, or red-brown, fissured |
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(2) |
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Bark gray, smooth |
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(3) |
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| 2 (1) |
Leaf more deeply 2- or 3-toothed; small wing and nutlet (3.2-3.8 cm); bark orange-brown or red-brown. |
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93 A. griseum |
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Leaf margin entire or shallowly 2- or 3-toothed; large wing and nutlet (3.5-4.5 cm); bark yellow-brown. |
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94 A. triflorum |
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| 3 (1) |
Young branchlets and abaxial surface of leaves pubescent. |
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95 A. nikoense |
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Young branchlets and abaxial surface of leaves glabrous |
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(4) |
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| 4 (3) |
Inflorescence usually 3-flowered; leaflets lanceolate, 5-10 × 1.5-3 cm. |
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96 A. mandshuricum |
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Inflorescence 20-30-flowered; leaflets oblong-lanceolate, 7-14 × 2-4 cm. |
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97 A. sutchuenense |
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Lower Taxa
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