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FOC | Family List | FOC Vol. 4 | Betulaceae

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.

1 Bracts narrowly elliptic or obovate-lanceolate, (20-)25-26 mm, constricted into a stipe at base; female inflorescence loosely racemose   1 Ostrya rehderiana
+ Bracts elliptic, ovate-oblong, or obovate-oblong, 1.5-2.5 mm, not constricted into a stipe at base; female inflorescence densely racemose.   (2)
2 (1) Leaves with 10-15 lateral veins 5-10 mm apart on each side of midvein   2 Ostrya japonica
+ Leaves with 14-25 lateral veins 3-5 mm apart on each side of midvein.   (3)
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   3 Ostrya trichocarpa
+ 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.   (4)
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   4 Ostrya multinervis
+ 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   5 Ostrya yunnanensis

Lower Taxa


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