Ulmus × arbuscula
| Ulmus × arbuscula | |
|---|---|
| Hybrid parentage | U. glabra × U. pumila |
| Origin | Russia |
Ulmus × arbuscula E. Wolf [: "bushy" ] is a putative hybrid of Ulmus scabra (: glabra) and Ulmus pumila raised from seed collected from a large wych elm in the St. Petersburg Botanic Garden in 1902.[1][2] A similar crossing was cloned ('FL025') by the Istituto per la Protezione delle Piante (IPP), Florence, as part of the Italian elm breeding programme circa 2000.
Description[edit]
The St. Petersburg tree bore leaves 17–75 mm long with 20 lateral veins, side shoots <125 mm long and leader shoots <170 mm long, and was described as "a shrubby tree with pleasing foliage and branches appearing quite decorative".[2] In 1913 Späth described the tree as intermediate in appearance, with leaves 7–10 cm long, pointed-ovate, double-toothed, "dense-nerved", grey-green and rough above, light green below.[3]
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Ulmus FL025 (glabra x pumila) leaf, Cams Bay, Fareham, England -
Ulmus FL025 (glabra x pumila) leaf -
Ulmus FL025 (glabra x pumila) samara -
Ulmus FL025 Bark of Cams Bay tree -
Ulmus FL025 structure
Pests and diseases[edit]
A tree at the Ryston Hall arboretum,[4] Norfolk, listed as Ulmus arbusculata[5] and obtained from the Späth nursery in Berlin before 1914,[5] was killed by the earlier strain of Dutch elm disease prevalent in the 1930s.[citation needed]
Cultivation[edit]
The tree was for a short time from 1913 distributed by the Späth nursery, as Ulmus arbuscula E. Wolf, described as "(montana × pumila), ..an as yet uncommon hybrid",[3] a specimen being supplied to Ryston Hall at that time. It does not appear in their post-war catalogues. Another, labelled Ulmus arbuscula Wolf and described as a large tree, stood in the Nymphenburg Palace Park, Munich, in the mid-20th century.[6] Two trees survive in eastern European arboreta (see 'Accessions'). U. × arbuscula is not known to have been introduced to North America or Australasia.
Accessions[edit]
- Europe
- Butterfly Conservation Hants & IoW Branch elm trials, Cams Bay, Fareham, UK. One specimen of IPP clone 'FL025' planted circa 2005.
- Grange Farm Arboretum, Lincolnshire, UK. Acc. no. 1097 (grown from seed).
- Hortus Botanicus Nationalis, Salaspils, Latvia. Acc. nos. 18093, 18094. Planted 1964, no details available.[7]
- Strona Arboretum, University of Life Sciences, Warsaw, Poland.
References[edit]
- ^ Elwes, H. J. & Henry, A. (1913). The Trees of Great Britain and Ireland. Vol. 7, p.1827, Private publication, Edinburgh 1913. Reprinted 2014, Cambridge University Press, ISBN 978-1-108-06938-0
- ^ a b Wolf, Egbert (1910). "Neue Gehölze". Mitteilungen der Deutschen Dendrologischen Gesellschaft.
- ^ a b Späth, L., Catalogue 158 (1913-14; Berlin), p.136
- ^ rystonhall.co.uk/
- ^ a b Ryston Hall Arboretum catalogue. c. 1920. pp. 13–14.
- ^ "Herbarium specimen - L.1590714". Botany catalogues. Naturalis Biodiversity Center. Sheet labelled U. arbuscula Wolf, Nymphenburg Palace Park, Munich, specimen (1957); "Herbarium specimen - L.1590713". Botany catalogues. Naturalis Biodiversity Center. Sheet labelled U. arbuscula Wolf, Munich specimen (1954)
- ^ Hortus Botanicus Nationalis, Salaspils, Latvia, Accessions List 2006