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FOC | Family List | FOC Vol. 5 | Ulmaceae | Ulmus

10. Ulmus harbinensis S. Q. Nie & K. Q. Huang, Bull. Bot. Res., Harbin. 7(1): 151. 1987.

哈尔滨榆 ha er bin yu

Trees, to 15 m tall, d.b.h. to 32 cm, deciduous. Bark dark gray, irregularly and finely fissured. Branchlets grayish brown in first year, gray and glabrous in second year. Winter floral buds dark brown, cordate-globose, ca. 5 × 4 mm; bud scales lustrous. Leaf buds dark brown, conic, 3-4 × ca. 2.3 mm; bud scales pilose. Petiole pubescent; leaf blade obovate, 2-5.5 × 2-3.5 cm, abaxially with white tufted hairs in veins axils, margin doubly serrate; secondary veins 9-15 on each side of midvein. Inflorescences fascicled cymes, 20-30-flowered. Perianth tubular, 4-6-lobed, margin ciliate. Stamens 4 or 5. Stigmas 2-parted, pinnatifid. Samaras orbicular, broadly obovate, or ± orbicular, narrowly winged, glabrous except for stigmatic surface in notch; stalk ca. 2 mm. Seed at center of samara. Fl. Apr, fr. Jun.

* Mixed woods. Heilongjiang (Harbin).

This poorly understood species should be reinvestigated. It may be a hybrid between Ulmus pumila and another species.


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