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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.
The American elm is a deciduous tree which, under ideal conditions, can grow to heights of 21 to 35 meters (69 to 115 feet). [3] The trunk may have a diameter at breast height (dbh) of more than 1.2 m (4 ft), supporting a high, spreading umbrella-like canopy.
It was steadily weakened by viruses in Europe and had all but disappeared by the 1940s. However, the disease had a much greater and longer-lasting impact in North America, owing to the greater susceptibility of the American elm, Ulmus americana, which masked the emergence of the second, far more virulent strain of the disease Ophiostoma novo-ulmi.
The Ulmaceae (/ ʌ l ˈ m eɪ s i /) are a family of flowering plants that includes the elms (genus Ulmus), and the zelkovas (genus Zelkova). [3] Members of the family are widely distributed throughout the north temperate zone, and have a scattered distribution elsewhere except for Australasia.
The whole class of Portland roses was developed from that one rose. The first repeat-flowering class of rose with fancy European-style blossoms, the plants tend to be fairly short and shrubby, with a suckering habit, with proportionately short flower stalks. The main flowering is in the summer, but intermittent flowers continue into the autumn.
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 American Elm cultivar Ulmus americana 'Jefferson' was cloned from a tree growing near a path in front of the Freer Gallery of Art, close to the Smithsonian Institution Building ("The Castle") on the National Mall in Washington, D.C. [1] The United States National Park Service, which had planted the tree during the 1930s, cloned it in 1993 after screening tests showed that it possessed an ...
The American elm cultivar Ulmus americana 'Augustine', originally called 'Augustine Ascending', was cloned by Archie M. Augustine of the Augustine Nursery of Bloomington, Illinois, from a nursery seedling planted in 1927 in Normal, Illinois, and found to be columnar in habit. [2] [3] See also the similar cultivars 'Columnaris' and 'Ascendens ...
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