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Ulmus × Intermedia 'Fremont'
The hybrid elm cultivar ''Ulmus × intermedia'' 'Fremont' is a little-known American hybrid cultivar propagated from a tree found on the Lloyd Moffet property (formerly the Plumfield Nurseries) at Fremont, Nebraska. The hybrid is believed to have arisen from a crossing of ''Ulmus pumila'' (female parent) and one of the spring-flowering elms native to North America,Dodge, A. F. (1960). ''Woody ornamental and shelter plants for the North Central Region 1954–1959: Five year report on regional plantings of Fremont Hybrid Elm''. USDA - ARS, Iowa State University, Ames, Iowa, USA probably ''Ulmus rubra''. The source tree was probably an unsold specimen of the Plumfield Nurseries' "Hybrid Elm", a cross between "Chinese elm" (as ''U. pumila'' was then called) and Red elm ''U. rubra'', briefly marketed from 1942 to 1943, but not appearing in later catalogues. This hybrid may have been the same as the cultivar sourced from Plumfield Nurseries at this time as "Hybrid Chinese Elm" and l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ulmus × Intermedia
''Ulmus × intermedia'' Elowsky is a natural hybrid elm occurring across Nebraska and several other Midwestern states, derived from the crossing of ''Ulmus rubra'' and ''Ulmus pumila''. As Red Elm ''U. rubra'' is far less fertile, and highly susceptible to Dutch elm disease (:DED), it could eventually be hybridized out of existence by ''U. × intermedia''. Schlautman, B., Zalapa, J., & Brunet, J. (2012). Genotypic and phenotypic characterization of Ulmus pumila (Siberian elm), Ulmus rubra (Red elm) and their hybrids. ''Proc. Nebraska Acad. Sci. 2012''. 106–107. The hybrid was first reported from the wild in the Chicago region in 1950 and was provisionally named ''U.'' × ''notha'' Wilhelm & Ware in 1994. The horticulture industry made a number of artificial crosses of the two species, such as 'Coolshade' and 'Fremont', in an attempt to create ornamental trees resistant to DED. Description ''Ulmus × intermedia'' is significantly different from both parental species, exc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ulmus Pumila
''Ulmus pumila'', the Siberian elm, is a tree native to Asia. It is also known as the Asiatic elm and dwarf elm, but sometimes miscalled the 'Chinese Elm' (''Ulmus parvifolia''). ''U. pumila'' has been widely cultivated throughout Asia, North America, Argentina, and southern Europe, becoming naturalized in many places, notably across much of the United States. Description The Siberian elm is usually a small to medium-sized, often bushy, deciduous tree growing to tall, the diameter at breast height to . The bark is dark gray, irregularly longitudinally fissured. The branchlets are yellowish gray, glabrous or pubescent, unwinged and without a corky layer, with scattered lenticels. The winter buds dark brown to red-brown, globose to ovoid. The petiole is , pubescent, the leaf blade elliptic-ovate to elliptic-lanceolate, , the colour changing from dark green to yellow in autumn.Fu, L., Xin, Y. & Whittemore, A. (2002). Ulmaceae, in Wu, Z. & Raven, P. (eds) ''Flora of China ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ulmus Rubra
''Ulmus rubra'', the slippery elm, is a species of elm native to eastern North America. Other common names include red elm, gray elm, soft elm, moose elm, and Indian elm. Description ''Ulmus rubra'' is a medium-sized deciduous tree with a spreading head of branches,Hillier & Sons. (1990). ''Hillier's Manual of Trees & Shrubs, 5th ed.''. David & Charles, Newton Abbot, UK commonly growing to , very occasionally over in height. Its heartwood is reddish-brown. The broad oblong to obovate leaves are long, rough above but velvety below, with coarse double-serrate margins, acuminate apices and oblique bases; the petioles are long.Bean, W. J. (1970). ''Trees & Shrubs Hardy in the British Isles'', 8th ed., p. 656. (2nd impression 1976) John Murray, London. The leaves are often tinged red on emergence, turning dark green by summer and a dull yellow in autumn. The perfect, apetalous, wind-pollinated flowers are produced before the leaves in early spring, usually in tight, short-s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hybrid (biology)
In biology, a hybrid is the offspring resulting from combining the qualities of two organisms of different breeds, varieties, species or genera through sexual reproduction. Hybrids are not always intermediates between their parents (such as in blending inheritance), but can show hybrid vigor, sometimes growing larger or taller than either parent. The concept of a hybrid is interpreted differently in animal and plant breeding, where there is interest in the individual parentage. In genetics, attention is focused on the numbers of chromosomes. In taxonomy, a key question is how closely related the parent species are. Species are reproductively isolated by strong barriers to hybridisation, which include genetic and morphological differences, differing times of fertility, mating behaviors and cues, and physiological rejection of sperm cells or the developing embryo. Some act before fertilization and others after it. Similar barriers exist in plants, with differences in flowering tim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cultivar
A cultivar is a type of cultivated plant that people have selected for desired traits and when propagated retain those traits. Methods used to propagate cultivars include: division, root and stem cuttings, offsets, grafting, tissue culture, or carefully controlled seed production. Most cultivars arise from purposeful human manipulation, but some originate from wild plants that have distinctive characteristics. Cultivar names are chosen according to rules of the International Code of Nomenclature for Cultivated Plants (ICNCP), and not all cultivated plants qualify as cultivars. Horticulturists generally believe the word ''cultivar''''Cultivar'' () has two meanings, as explained in ''Formal definition'': it is a classification category and a taxonomic unit within the category. When referring to a taxon, the word does not apply to an individual plant but to all plants that share the unique characteristics that define the cultivar. was coined as a term meaning "cultivated variety ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fremont, Nebraska
Fremont is a city and county seat of Dodge County in the eastern portion of the state of Nebraska in the Midwestern United States. The population was 27,141 at the 2020 census. Fremont is the home of Midland University. History From the 1830s to the 1860s, the area saw a great deal of traffic due to the Mormon Trail, which passed along the north bank of the Platte River. A ferry connected the two banks of the Elkhorn River near Fremont. It was a major overland route for emigrant settlers going to the West, the military and hunters. Fremont was laid out in 1856 in anticipation that the railroad would be extended to that site. It was named after the American explorer, politician and military official General John C. Frémont. By 1857, there were 13 log houses in the town. The Union Pacific Railroad reached the town in December 1865 becoming the first railroad into the future rail hub. Sioux City and Pacific Railroad completed track into the town in 1868 with the Elkhorn Vall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ulmus 'Hamburg'
The hybrid elm cultivar ''Ulmus'' 'Hamburg' was originally raised by the Plumfield Nurseries, Fremont, Nebraska, circa 1932, after its discovery by Mr. Lloyd Moffet in a bed of Siberian Elm ''Ulmus pumila'' seedlings from Tekamah. It was later marketed by Interstate Nurseries, Hamburg, Iowa, from 1948, as 'Interstate's New Hamburg Hybrid Elm'. Green stated that it was originally said be a hybrid of ''Ulmus pumila'' (female parent) and ''Ulmus americana'', but the Hamburg Nurseries of Iowa made no such claim for it in their catalogues from 1948 onwards. It is now considered more likely that ''Ulmus rubra'' was the male parent, as it was also known as 'Hybrid Chinese Elm', and therefore probably synonymous with Plumfield Nurseries' 'Hybrid elm' of the same date, a known crossing of ''U. pumila'' and ''U. rubra'', – and so, perhaps, also synonymous with ''Ulmus × intermedia'' 'Fremont', an elm of the same parentage found a little later in Plumfield Nurseries. An ''U. pumila'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arnold Arboretum
The Arnold Arboretum of Harvard University is a botanical research institution and free public park, located in the Jamaica Plain and Roslindale neighborhoods of Boston, Massachusetts. Established in 1872, it is the oldest public arboretum in North America. The landscape was designed by Charles Sprague Sargent and Frederick Law Olmsted and is the second largest "link" in the Emerald Necklace. The Arnold Arboretum's collection of temperate trees, shrubs, and vines has a particular emphasis on the plants of the eastern United States and eastern Asia, where arboretum staff and colleagues are actively sourcing new material on plant collecting expeditions. The arboretum supports research in its landscape and in its Weld Hill Research Building. History The Arboretum was founded in 1872 when the President and Fellows of Harvard College became trustees of a portion of the estate of James Arnold (1781–1868), a whaling merchant from New Bedford, Massachusetts. Arnold specified that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harvard University
Harvard University is a private Ivy League research university in Cambridge, Massachusetts. Founded in 1636 as Harvard College and named for its first benefactor, the Puritan clergyman John Harvard, it is the oldest institution of higher learning in the United States and one of the most prestigious and highly ranked universities in the world. The university is composed of ten academic faculties plus Harvard Radcliffe Institute. The Faculty of Arts and Sciences offers study in a wide range of undergraduate and graduate academic disciplines, and other faculties offer only graduate degrees, including professional degrees. Harvard has three main campuses: the Cambridge campus centered on Harvard Yard; an adjoining campus immediately across Charles River in the Allston neighborhood of Boston; and the medical campus in Boston's Longwood Medical Area. Harvard's endowment is valued at $50.9 billion, making it the wealthiest academic institution in the world. Endowment inco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dutch Elm Disease
Dutch elm disease (DED) is caused by a member of the sac fungi (Ascomycota) affecting elm trees, and is spread by elm bark beetles. Although believed to be originally native to Asia, the disease was accidentally introduced into Americas, America, Europe, and New Zealand. In these regions it has devastated native populations of elms that did not have resistance to the disease. The name "Dutch elm disease" refers to its identification in 1921 and later in the Netherlands by Dutch phytopathologists Marie Beatrice Schol-Schwarz, Bea Schwarz and Christine Buisman, who both worked with professor Johanna Westerdijk. The disease affects species in the genera ''Ulmus'' and ''Zelkova''; therefore it is not specific to the Ulmus × hollandica, Dutch elm hybrid. Overview Dutch elm disease (DED) is caused by ascomycete microfungi. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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