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

32. Betula middendorfii Trautvetter & C. A. Meyer in Middendorff, Reise Sibir. 1(2), Fl. Ochot. Phaenog. 2: 84, t. 21. 1856.

扇叶桦 shan ye hua

Shrubs to 2 m tall; bark red-brown, shiny. Branches spreading, dark red-brown, glabrous, shiny, becoming glaucous; branchlets black-brown, densely pubescent and resinous glandular. Petiole ca. 3 mm, densely pubescent; leaf blade broadly obovate, 1.5-2.7 × 1.2-2.1 cm, abaxially light green, sparsely resinous punctate, glabrous, adaxially dark green and shiny, base broadly cuneate or rounded-cuneate, margin irregularly and obtusely doubly serrate, apex obtuse or subrounded; lateral veins 3-5 on each side of midvein. Female inflorescence spreading or pendulous, oblong, 1.2-1.5 cm × 8-9 mm; peduncle 8-10 mm, slender, densely pubescent and resinous glandular, bracts ca. 6 mm, ciliate, 3-lobed, middle lobe ovate, lateral lobes erect, obovate, ca. as long as middle lobe. Nutlet ovate, ca. 2 × 1.5 mm, glabrous, with membranous wings slightly wider than nutlet. Fl. Jun-Jul, fr. Aug-Sep. 2n = 42, 48, 56.

Thickets; 1000-1200 m. Heilongjiang (Daxinganling), Nei Mongol [Russia (E Siberia)]


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