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The Siberian elm cultivar Ulmus pumila 'Green King' was once believed to have been derived from a crossing of the Siberian Elm Ulmus pumila with the American Red Elm Ulmus rubra. However, it is now apparent the tree originated as a sport of U. pumila in 1939 at the Neosho Nurseries, Neosho, Missouri.
The Chinese Elm cultivar Ulmus parvifolia 'Sempervirens' is an American introduction, commonly known by the synonym 'Evergreen', and may also be in synonymy for U. parvifolia 'Pendens'.
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 putative Wych Elm cultivar Ulmus glabra 'Holgeri' originated in Sweden, where it was described by Holger Jensen of Ramlösa Plantskola, Helsingborg, in 1921. It was distributed by the Späth nursery of Berlin in the 1920s and '30s as Ulmus montana Holgeri. Späth used U. montana both for wych and for U. × hollandica hybrids like 'Dampieri', so the name does not necessarily imply a wych cultivar. In The Netherlands the tree was classified as an Ulmus × hollandica hybrid, a 1932 herbarium specimen from a tree in The Hague supplied by Späth being labelled Ulmus hollandica var. holgeri (Jensen).
The Wych Elm cultivar Ulmus glabra 'Latifolia Aurea' was listed by Schelle in Beissner et al, Handbuch der Laubholz-Benennung (1903), as Ulmus glabraMillerlatifolia aurea, but without description. In the Netherlands in the late 19th and early 20th centuries, however, Ulmus montana latifolia aurea was a synonym of the wych cultivar 'Lutescens', and Green reclassified Schelle's 'Latifolia aurea' as a form of U. glabraHudson.
The elm cultivar Ulmus 'Rugosa' [:'wrinkled', the leaves], was first listed in Audibert's Tonelle (1817), as "U. campestris Linn. 'Rugosa' = orme d'Avignon [Avignon elm] ", but without description. A description followed in the Revue horticole, 1829. Green (1964) identified this cultivar with one listed by Hartwig and Rümpler in Illustrirtes Gehölzbuch (1875) as Ulmus montana var. rugosaHort.. A cultivar of the same name appeared in Loddiges' catalogue of 1836 and was identified by Loudon in Arboretum et Fruticetum Britannicum (1838) as Ulmus montana var. rugosaMasters, Masters naming the tree maple-bark elm. Ulmus montana was used at the time both for wych cultivars and for some cultivars of the Ulmus × hollandica group.
The Wych Elm cultivar Ulmus glabra 'Tomentosa' was first listed as Ulmus tomentosa by Kirchner in Arboretum Muscaviense (1864). The Hesse Nursery of Weener, Germany, distributed an Ulmus montana tomentosa in the 1930s. Green listed it as a wych elm cultivar.
The Field Elm cultivar Ulmus minor 'Concavaefolia' was briefly described by Loudon in Arboretum et Fruticetum Britannicum (1838), as Ulmus campestris var. concavaefolia. A fuller description followed in Petzold and Kirchner 's Arboretum Muscaviense (1864). Henry noted that Loudon's "insufficiently described" U. campestris var. concavaefolia seemed to be identical with the field elm cultivar 'Webbiana', a view repeated by Krüssmann.
The elm cultivar Ulmus 'Globosa' was first described in the Späth nursery catalogue of 1892–93. Considered "probably Ulmus carpinifolia " by Green
The hybrid elm Ulmus × hollandica 'Viscosa' is probably one of a number of cultivars arising from the crossing of the Wych Elm U. glabra with a variety of Field Elm U. minor. The tree was listed by Loddiges, in his catalogue of 1836 and two years later by Loudon in Arboretum et Fruticetum Britannicum 3: 1378, 1838, as U. viscosa. An early specimen in the Herbarium Dumortier named U. viscosaAudibert was later sunk by Melville as U. × hollandica.
The hybrid elm cultivar Ulmus × intermedia 'Willis' originated as a crossing made by a Mr Minnick of Kansas. Almost certainly derived from a crossing of the Siberian Elm Ulmus pumila and the Red Elm Ulmus rubra, it was originally believed that the male parent was the American Elm Ulmus americana.
The elm cultivar Ulmus 'Alata' was first mentioned by Kirchner, in Petzold & Kirchner, Arboretum Muscaviense 566, 1864, as Ulmus montana alata, but without description.
Ulmus × hollandica 'Angustifolia' is one of a number of hybrids arising from the crossing of the Wych Elm U. glabra with a variety of Field Elm U. minor, first identified as Ulmus hollandica var. angustifolia by Weston in The Universal Botanist and Nurseryman 1: 315, 1770.
The elm cultivar Ulmus 'Folia Variegata Pendula' was described by C. de Vos in 1867, as Ulmus suberosa folia variegata pendula. Green considered it possibly one of a number of Ulmus × hollandica cultivars, arising from the crossing of Wych Elm Ulmus glabra with Field Elm Ulmus minor.
The American elm cultivar Ulmus americana 'Pendula' was originally listed by William Aiton in Hort. Kew, 1: 320, 1789, as U. americana var. pendula, cloned in England in 1752 by James Gordon. From the 1880s the Späth nursery of Berlin supplied a cultivar at first listed as Ulmus fulva (Michx.) pendulaHort., which in their 1899 catalogue was queried as a possible variety of U. americana, and which thereafter appeared in their early 20th-century catalogues as U. americana pendula. The Scampston Elm, Ulmus × hollandica 'Scampstoniensis', in cultivation on both sides of the Atlantic in the 19th and 20th centuries, was occasionally referred to as 'American Weeping Elm' or Ulmus americana pendula. This cultivar, however, was distinguished by Späth from his Ulmus americana pendula.
The elm cultivar Ulmus 'Nigrescens' was identified by Pynaert as Ulmus campestris betulaefolia nigrescens. Considered by Green to be "probably Ulmus carpinifolia , but said to have been raised from seed of Purpurea".
The Field Elm cultivar Ulmus minor 'Purpurascens' was listed by Lavallée in Arboretum Segrezianum (1877) as U. campestris var. purpurascens (purpurea), but without description, and later by Schneider in Illustriertes Handbuch der Laubholzkunde (1904). Krüssmann in Handbuch der Laubgehölze (1962) identified it as a cultivar.
The elm cultivar Ulmus 'Pyramidalis Bertini' was listed by Lavallée without description in 1877 as Ulmus campestris var. pyramidalis Bertini. Considered "possibly Ulmus carpinifolia" by Green.
The elm cultivar Ulmus 'Rotundifolia' was raised from seed at the Jardin des plantes, Paris, and first described by Carrière in Revue Horticole, 1868, as Ulmus rotundifolia. It was later listed by Mottet in Nicholson & Mottet, Dictionnaire pratique d'horticulture et de jardinage (1898), as Ulmus campestris var.rotundifoliaHort.. It was considered "possibly Ulmus carpinifolia" by Green.
The elm cultivar Ulmus 'Sericea' was first listed by Lavallée in Arboretum Segrezianum 236, 1877, as Ulmus campestris var. sericea, but without description. Deemed "possibly U. carpinifolia" (:minor) by Green
References
- ↑ Green, Peter Shaw (1964). "Registration of cultivar names in Ulmus". Arnoldia. Arnold Arboretum, Harvard University. 24 (6–8): 41–80. Retrieved 16 February 2017.