sentences:  Krüssmann confirmed it as a field elm cultivar.Not to be confused with the wych elm cultivar with longitudinally up-curling leaves, "U. glabra" 'Concavaefolia'.Petzold and Kirchner in "Arboretum Muscaviense" (1864) described the leaves of their "Ulmus campestris concavaefolia" (Loudon), as "short and rounded, dark green above and whitish green below, more or less concave, that is, curling upwards at the edges so that the pale underside is more prominent than the darker upper" – a description, as Henry noted, that exactly matches 'Webbiana'.