落叶榆
2.type genus of family Ulmaceae; deciduous trees having simple serrate leaves; widely distributed in temperate regions.
3.New materials of sporopollen from the upper part of Shexing Formation of the Dzhong-Nama section in the Lhunzhub Basin of Lhasa block are reported in this paper. Characteristics of the sporopollen assemblage are:Most of the found sporopollen are common elements of Paleogene, so the related strata are impossible to be Cretaceous sediments; The assumed deciduous and latifoliate vegetation including Alnipollenites, Betulaepollenites, Carpiniptes, Quercoidites, Juglanspollenites, Ulmipollenites, Tiliaepollenites et al.
4.Any of various deciduous trees of the genus Ulmus, characteristically having arching or curving branches and serrate leaves with asymmetrical bases. Elms are widely planted as shade trees.
5.Byctiscus ulmi is one of the main insect pests in Weeping Elm of Xining region. The insect pest is happened a generation in a year in Xining region. 14.8 ovums were borthed by a female pest.
