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After pollination, seeds of spring-flowering elms ripen and fall at the start of summer (June); they remain viable for only a few days. They are planted in sandy potting soil at a depth of 1 cm, and germinate in three weeks. Slow-germinating American elm will remain dormant until the second season. [12]
Ulmus americana, generally known as the American elm or, less commonly, as the white elm or water elm, [a] is a species of elm native to eastern North America. The trees can live for several hundred years.
Ulmus americana L. var. glabra Planch. Accepted Name: Ulmus americana L. Ulmus americana L. var. pendula Aiton . Accepted Name: Ulmus americana L. Ulmus americana L. var. scabra Spach . Accepted Name: Ulmus americana L. Ulmus americana L. var. foliis variegatis Hort. Loudon. Accepted Name: Ulmus americana 'Folia Aurea Variegata' Ulmus americana ...
Few flowering plants self-pollinate; some can provide their own pollen (self fertile), but require a pollinator to move the pollen; others are dependent on cross pollination from a genetically different source of viable pollen, through the activity of pollinators. One of the possible pollinators to assist in cross-pollination are honeybees.
Ulmus fushunensis Wang, Manchester, Li, & Geng; Ulmus minima Ward; Ulmus minoensis Huzioka; Ulmus miopumila Hu & Chaney; Ulmus moorei Chaney & Elias; Ulmus moragensis Axelrod nom. dubium; Ulmus newberryi Knowlton; Ulmus okanaganensis Denk & Dillhoff (subgenus Ulmus) Ulmus owyheensis Smith; Ulmus paucidentata Smith; Ulmus protojaponica Tanai ...
The starting-points for List of elm cultivars, hybrids and hybrid cultivars were fourfold: (1) Green's 'Registration of Cultivar Names in Ulmus ' (1964), [1] based on the contemporary nomenclature of elm species and wild hybrids; (2) Krüssmann's confirmation or correction of cultivar-names in his monumental Handbuch der Laubgehölze (1976); [2] (3) Heybroek's table of Netherlands research ...
Allogamy – cross pollination, when one plant pollinates another plant; Anemophilous – wind-pollinated. Autogamy – self-pollination, when the flowers of the same plant pollinate each other, including a flower pollinating itself. Cantharophilous – beetle-pollinated. Chiropterophilous – bat-pollinated.
Weeping elm by Plymouth Congregational Church, Plainfield, Illinois (1941) Morton Arboretum's Ulmus americana f. pendula (2009). The U. americana pendula planted at the Dominion Arboretum, Ottawa, in 1889 may have been Späth's mis-named Ulmus fulva (Mchx) pendula, later corrected in arboretum lists, since Späth supplied many of the 1880s' and 1890s' elms there. [14]