假春榆 jia chun yu

Trees, to 10 m tall, deciduous. Branchlets yellowish gray, unwinged, without a corky layer when young, densely or sparsely black lenticellate. Winter buds ± orbicular to ovoid-orbicular; bud scale margin densely white ciliate. Petiole 5-7 mm, pubescent; leaf blade ovate to ± obovate, 2-5.5 × 1-2.5 cm, abaxially pubescent, adaxially densely hirsute or with trichome scars, base oblique, margin doubly serrate, apex acuminate; secondary veins 12-17 on each side of midvein. Inflorescences fascicled cymes on second year branchlets. Perianth campanulate, glabrous, 4-lobed. Samara elliptic-oblong, obovate-oblong, or obovate-orbicular, 2-2.5 × 1.5-2 cm, glabrous except for pubescence on stigmatic surface in notch; stalk ca. 2 mm, pubescent; wings ± thick; perianth persistent. Seed at center of samara. Fl. and fr. Apr-Jun.

* Heilongjiang (Harbin).

This poorly understood species should be reinvestigated. It may be of hybrid origin.