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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.
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.
The perfect apetalous wind-pollinated flowers are vernal, appearing before the leaves unfold, born in long-pedicelled fascicles of 3 or 4. The fruit is a samara maturing in the spring as the leaves unfold; about 12 mm (½ inch) long, oval to oblong-obovate, deeply notched at apex, margin ciliate with smooth surfaces.
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 ...
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.
Diagram of flower parts. In botany, floral morphology is the study of the diversity of forms and structures presented by the flower, which, by definition, is a branch of limited growth that bears the modified leaves responsible for reproduction and protection of the gametes, called floral pieces.
The American Elm cultivar Ulmus americana 'Princeton' was originally selected in 1922 by New Jersey nurseryman William Flemer of Princeton Nurseries for its aesthetic merit. 'Princeton' was later found to have a moderate resistance to Dutch elm disease (DED).