Ulmus × arbuscula

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.

Ulmus × arbuscula
Hybrid parentageU. glabra × U. pumila
OriginRussia

Description

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]

  • 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

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.

Cultivation

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][7] Two trees survive in eastern European arboreta (see 'Accessions'). U. × arbuscula is not known to have been introduced to North America or Australasia.

Accessions
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.[8]
  • Strona Arboretum, University of Life Sciences, Warsaw, Poland.

References
  1. 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
  2. Wolf, Egbert (1910). "Neue Gehölze". Mitteilungen der Deutschen Dendrologischen Gesellschaft.
  3. Späth, L., Catalogue 158 (1913-14; Berlin), p.136
  4. rystonhall.co.uk/
  5. Ryston Hall Arboretum catalogue. c. 1920. pp. 13–14.
  6. bioportal.naturalis.nl, specimen L.1590714
  7. bioportal.naturalis.nl, specimen L.1590713
  8. Hortus Botanicus Nationalis, Salaspils, Latvia, Accessions List 2006
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