| Ulmus minor 'Reverti' | |
|---|---|
 Ulmus minor 'Reverti' | |
| Species | Ulmus minor |
| Cultivar | 'Reverti' |
| Origin | Hungary |
The Field Elm cultivar Ulmus minor 'Reverti' is a University of Wisconsin–Madison selection (No. 380-1), registered and named in Germany in 1993 by Conrad Appel, Darmstadt (ceased trading c. 2006).
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'Reverti' was grown from Hungarian seed and found to the most disease-resistant of the species in the Wisconsin programme. [1] The tree is now in commerce in the Netherlands.
Ulmus 'Homestead' is an American hybrid elm cultivar raised by Alden Townsend of the United States National Arboretum at the Nursery Crops Laboratory in Delaware, Ohio. The cultivar arose from a 1970 crossing of the Siberian Elm Ulmus pumila with the hybrid N 215, the latter grown from seed sent in 1960 to the University of Wisconsin-Madison elm breeding team by Hans Heybroek of the De Dorschkamp Research Institute in the Netherlands. Tested in the US National Elm Trial coordinated by Colorado State University, 'Homestead' averaged a survival rate of 85% after 10 years. 'Homestead' was released to commerce without patent restrictions in 1984.
The hybrid elm cultivar Ulmus × hollandica 'Pioneer' is an American clone arising from the crossing of two European species, Wych Elm U. glabra and Field Elm U. minor. Raised by the USDA station at Delaware, Ohio, in 1971, 'Pioneer' was released to commerce in 1983.
Ulmus 'Regal' is an American hybrid elm cultivar developed by the University of Wisconsin–Madison and released in 1983. 'Regal' was derived from seeds arising from the crossing of the Dutch hybrid clones 'Commelin' and '215' sent in 1960 by Hans M. Heybroek of the Dorschkamp Research Institute for Forestry & Landscape Planning, Wageningen, Netherlands.
The hybrid elm cultivar Ulmus × hollandica 'Belgica', one of a number of hybrids arising from the crossing of Wych Elm with a variety of Field Elm, was reputedly raised in the nurseries of the Abbey of the Dunes, Veurne, in 1694. Popular throughout Belgium and the Netherlands in the 19th century both as an ornamental and as a shelter-belt tree, it was the 'Hollandse iep' in these countries, as distinct from the tree known as 'Dutch Elm' in Great Britain and Ireland since the 17th century: Ulmus × hollandica 'Major'. In Francophone Belgium it was known as orme gras de Malines.
Ulmus 'Morton' is an elm cultivar cloned from a putative intraspecific hybrid planted at the Morton Arboretum in 1924, which itself originated as seed collected from a tree at the Arnold Arboretum in Massachusetts. Although this tree was originally identified as Ulmus crassifolia, it is now believed to have been a hybrid of the Japanese elm and Wilson's elm. Accolade has proven to be the most successful cultivar tested in the US National Elm Trial, averaging a survival rate of 92.5% overall.
Ulmus 'Cathedral' is a hybrid cultivar raised at University of Wisconsin–Madison patented in 1994. Arising from a chance crossing of the Japanese elm and Siberian elm, seed was sent in 1958 by Prof. Nobuku Takahashi and his colleagues at the Sapporo Botanical Garden of Hokkaido University, Sapporo, to Eugene Smalley at Wisconsin–Madison; 'Cathedral' is thus a sibling of 'Sapporo Autumn Gold' and 'New Horizon'.
The Field Elm cultivar Ulmus minor 'Hoersholmiensis', Hoersholm elm, originated from seed sown at the Hørsholm Planteskole, Denmark, c. 1885, where it was propagated by the nursery proprietor Lars Nielsen. The Späth nursery of Berlin, however, which marketed 'Hoersholmiensis' in the interwar period, considered it a hybrid rather than a form of field elm, a view shared by Christine Buisman, who in 1931 labelled a herbarium specimen from a Späth-sourced tree in The Hague as a form of Ulmus × hollandica.
The hybrid elm cultivar Ulmus 'Den Haag' is a Dutch development derived from a chance crossing of the Siberian Elm cultivar Ulmus pumila 'Pinnato-ramosa' and the Belgian Elm Ulmus × hollandica 'Belgica'. S. G. A. Doorenbos (1891-1980), Director of Public Parks in The Hague, finding that seeds he had sown in 1936 from the Zuiderpark 'Pinnato-ramosa' had hybridized with the local 'Belgica', selected six for trials. The best was cloned and grafted on 'Belgica' rootstock as 'Den Haag'; it was planted first in that city, then released to nurseries elsewhere in the Netherlands. The other five were also planted in The Hague.
The Siberian Elm cultivar Ulmus pumila 'Pendula' is from northern China, where it is known as Lung chao yü shu. It was classified by Frank Meyer in Fengtai in 1908, and introduced to the United States by him from the Peking Botanical Garden as Weeping Chinese Elm. The USDA plant inventory record (1916) noted that it was a "rare variety even in China". It was confirmed as an U. pumila cultivar by Krüssmann (1962).
The Japanese Elm cultivar Ulmus davidianavar.japonica 'Reperta' was a University of Wisconsin–Madison selection named and registered in Germany by Conrad-Appel, Darmstadt, in 1993.
Ulmus 'Rebona' is an American hybrid cultivar raised by the Wisconsin Alumni Research Foundation (WARF) as selection 'W916', derived from a crossing of Japanese Elm clone W43-8 = 'Reseda' with Siberian Elm clone W426 grown from seed collected from a street tree at Yankton, South Dakota. The tree was registered in 1993 by Conrad Appel KG, of Darmstadt and is a sibling of 'New Horizon'. In Europe, 'Rebona' is marketed as a Resista elm protected under E U breeders' rights.
Ulmus 'Recerta' is an American hybrid cultivar raised by the Wisconsin Alumni Research Foundation (WARF) as selection '196-5' from seed obtained from a Siberian Elm Ulmus pumila in Volgagrad, Russia; the male parent deduced as the Field Elm Ulmus minor.
Ulmus 'Repura' is an American elm cultivar raised by the Wisconsin Alumni Research Foundation (WARF) as selection '1193-4', derived from a crossing of 'Regal' and a crossing of Ulmus rubra with the hybrid Ulmus pumila × Ulmus davidiana var. japonica.
Ulmus 'Revera' is an American hybrid cultivar raised by the Wisconsin Alumni Research Foundation (WARF) as selection '1193-3' which, like 'Reperta', was derived from a crossing of 'Regal' with a crossing of Ulmus rubra and the hybrid Ulmus pumila × Ulmus davidiana var. japonica.
The Chinese Elm cultivar Ulmus parvifolia 'Nire-keyaki' is a dwarf variety principally used for bonsai.
The Japanese Elm cultivar Ulmus davidianavar.japonica 'Reseda' is an American cultivar raised by the Wisconsin Alumni Research Foundation (WARF) as clone no. 43-8. 'Reseda' was grown from seed sent from Hokkaido, Japan, in the late 1950s. Although not released in its own right, it was destined to become the female parent of the highly successful hybrid cultivars 'New Horizon' and 'Rebona'.
Ulmus 'Rebella' is an American hybrid cultivar elm raised from a rare crossing of the Chinese Elm U. parvifolia and the American Elm U. americana by Smalley and Guries of the Wisconsin Alumni Research Foundation in 1987 as clone 2245-9. Grown under licence by Eisele GmbH, Darmstadt, Germany, 'Rebella' was released to commerce in Europe in 2011.
The Siberian elm cultivar Ulmus pumila 'Poort Bulten' hails from Arboretum Poort Bulten in Losser, Netherlands. This tree was for many years mistaken for Planera aquatica or 'water elm' and commercially propagated under that name.
The European White Elm cultivar Ulmus laevis 'Helena' is a Dutch introduction in commerce circa 2010 at the Boomkwekerij s'Herenland at Randwijk. The cultivar was cloned from a tree planted as one of a line of 17 White Elms at Eibergen circa 1900, which developed a straight central leader.
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