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FOC | Family List | FOC Vol. 4 | Betulaceae | Betula

12. Betula delavayi Franchet, J. Bot. (Morot). 13: 205. 1899.

高山桦 gao shan hua

Shrubs or trees to 8 m tall; bark dark gray. Branches diagonal or prostrate, sometimes erect; branchlets brown, densely yellow villous. Petiole 5-10 mm, sparsely villous; leaf blade elliptic, oblong, ovate, or broadly ovate, (1.5-)2-7 × 1-4 cm, abaxially sparsely resinous punctate and white sericeous-villous along veins, adaxially densely yellow sericeous-villous when young, base rounded, margin doubly minutely serrate, apex acuminate or subrounded; lateral veins (5-)9-21 on each side of midvein. Female inflorescence oblong or oblong-cylindric, 1-2.5 cm × 5-10 mm; peduncle ca. 5 mm, villous; bracts 5-10 mm, pubescent, ciliate, sometimes densely villous, 3-lobed, middle lobe lanceolate or oblong, lateral lobes spreading, ovate, ca. 1/2 as long as middle lobe. Nutlet obovate or elliptic, 2.5-3 × 1.5-2 mm, pubescent, with very narrow wings. Fl. Jun, fr. Jul-Aug.

* Broad-leaved forests, thickets; 2400-4000 m. ?Gansu, W Hubei, ?Qinghai, W Sichuan, E Xizang, NW Yunnan.

1 Leaves 1.5-2 cm, lateral veins 5-10 on each side of midvein; female inflorescence ca. 10 × 5 mm   12c var. microstachya
+ Leaves 3-7 cm, lateral veins 10-21 on each side of midvein; female inflorescence 15-25 × 7-10 mm.   (2)
2 (1) Leaves with 10-14 lateral veins on each side of midvein; bracts not densely villous, ciliate   12a var. delavayi
+ Leaves with 19-21 lateral veins on each side of midvein; bracts densely villous and ciliate   12b var. polyneura

Lower Taxa


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