Elm family (Umaceae)
Tree of heights up to 30(35.5) m and breast-height diameters to 150(282) cm. Can live for more than 200 years. Trunks often with splits, suckers and buttresses at base. Leaves to 15 cm long, asymmetrical at base, broadly double-toothed on margins, underside softly hairy, lemon-yellow in autumn. Flowers small, hermaphrodite or polygamous on long pedicels, and in bunches. Nutlets small, within finely hairy winged achene (samara) that hangs with others in stalked bunch. Ripens early and falls in late May and early June. Flowers Mar.-Apr., before leaves develop. Grows on moist eutrophic soils, mainly in riparian forest.
Descriptions devised by the team at the Independent Department of Forest Botany, Warsaw University of Life Sciences, i.e. L. Witkowska-Żuk, K. Marciszewska, W. Ciurzycki, A. Obidziński and P. Zaniewski.