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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.
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]
A list of tree species, grouped generally by biogeographic realm and specifically by bioregions, and shade tolerance. Shade-tolerant species are species that are able to thrive in the shade, and in the presence of natural competition by other plants.
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 ...
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 ...
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]
The most unusual feature of E. vulgare is the protection of the nectar inside the flower from vaporization (when weather is hot) or flushing away (when rains). [9] major – 300–1,000 lb/acre honey depending on soil, 500–2000 lb of dark blue pollen F Globe thistle: Echinops ritro: Annual 8 8 feral major F Fireweed: Epilobium angustifolium ...
Ulmus americana var. floridana, the Florida elm, first described as Ulmus floridana by Alvan Wentworth Chapman in the 1860s, is smaller than the type, and occurs naturally in north and central Florida south to Lake Okeechobee. [1]
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