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1. Fagus Linnaeus, Sp. Pl. 2: 997. 1753.
水青冈属 shui qing gang shu
Trees deciduous. Bark smooth. Winter buds elongated, reddish brown, apex acute. Leaves alternate, 2-ranked, plicate in bud; secondary veins ± parallel. Male inflorescence in leaf axils toward base of branchlets, a lax pedunculate head; flowers many; perianth 4-7-lobed; stamens 8-16; rudimentary ovary pubescent. Female inflorescences in axils of leaves; flowers usually 2, subtended by a single (3-or)4-parted cupule and surrounded by numerous bracts; styles 3, recurved. Cupules woody, (3 or)4-valved; bracts leaflike or filiform to short, triangular. Nuts (1 or)2(or 3), ovoid to 3-sided. Germination epigeal; cotyledons plicate.
Ten species: N temperate regions; four species (three endemic) in China.
The status of Fagus chienii W. C. Cheng (Contr. Biol. Lab. Chin. Assoc. Advancem. Sci., Sect. Bot. 10: 70. 1935) is uncertain. It is only known from the type collection (Pingwu,
Sichuan) and is similar to F. lucida, except for having longer recurved cupule bracts. Important timber trees.
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| 1 |
Cupules covered with leaflike bracts; leaf blade secondary veins curving upward, fusing near margin |
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1 Fagus engleriana |
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Cupules covered with filiform and recurved or short, triangular bracts; leaf blade secondary veins ending in teeth. |
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(2) |
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| 2 (1) |
Cupules 2-2.5 cm |
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2 Fagus longipetiolata |
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Cupules 0.7-1.5 cm. |
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(3) |
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| 3 (2) |
Cupules 0.7-1 cm; leaf blade abaxially with glandular dots and tufts of hairs in axil; cupule bracts linear, recurved |
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3 Fagus hayatae |
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Cupules 1-1.5 cm; leaf blade abaxially without glandular dots and tufts of hairs but with silky pubescence on midvein; cupule bracts tuberculate, closely appressed |
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4 Fagus lucida |
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Lower Taxa
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