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4. Ostrya Scopoli, Fl. Carniol. 414. 1760.
[nom. cons.]
铁木属 tie mu shu
Trees deciduous; bark scaly, rough. Buds ovoid, with many overlapping scales. Leaves irregularly and doubly serrate, sometimes lobulate. Male inflorescence pendulous, clustered at apex of branchlets, slender, naked during winter; bracts overlapping, each subtending 1 flower; perianth absent; stamens 3-14; filaments 2-cleft at apex, inserted at base of bracts; anthers each with 2 separate locules, pubescent at apex. Female inflorescence terminal, racemose; flowers paired; bracts overlapping, saccate, inflated, membranous, with reticulate veins and rigid hairs at base, usually lobed at apex; calyx adnate to ovary. Nutlet narrowly oblong, narrowly ovoid, ovoid-ellipsoid, or obovoid, ribbed, completely enclosed in bracts.
About 8 species: China, Japan, Korea; Europe, North America; five species (four endemic) in China.
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| 1 |
Bracts narrowly elliptic or obovate-lanceolate, (20-)25-26 mm, constricted into a stipe at base; female inflorescence loosely racemose |
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1 Ostrya rehderiana |
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Bracts elliptic, ovate-oblong, or obovate-oblong, 1.5-2.5 mm, not constricted into a stipe at base; female inflorescence densely racemose. |
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(2) |
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| 2 (1) |
Leaves with 10-15 lateral veins 5-10 mm apart on each side of midvein |
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2 Ostrya japonica |
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Leaves with 14-25 lateral veins 3-5 mm apart on each side of midvein. |
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(3) |
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| 3 (2) |
Leaves ovate, acuminate at apex, with 14-20 lateral veins on each side of midvein; bracts elliptic, 1.5-2.4 cm; nutlet obovoid, densely pubescent |
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3 Ostrya trichocarpa |
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Leaves ovate-lanceolate or oblong-lanceolate, caudate or caudate-acuminate at apex, with 18-25 lateral veins on each side of midvein; bracts narrowly elliptic or ovate-oblong, 1.5-2 cm; nutlet ovoid-ellipsoid, glabrous. |
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(4) |
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| 4 (3) |
Leaves densely pubescent adaxially, cordate, subrounded, or rarely broadly cuneate at base, lateral veins 18-25 on each side of midvein; bracts narrowly elliptic, 10-15 × 5-6 mm |
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4 Ostrya multinervis |
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Leaves sparsely pilose adaxially, broadly cuneate or rarely subrounded at base, lateral veins 18-20 on each side of midvein; bracts ovate-elliptic, 15-20 × 7-9 mm |
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5 Ostrya yunnanensis |
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Lower Taxa
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