Ulmus pumila 'Aurescens'

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Ulmus pumila 'Aurescens'
U. pumila 'Aurescens' foliage, April 2015.jpg
'Aurescens' spring foliage
Species Ulmus pumila
Cultivar 'Aurescens'
Origin Germany

The Ulmus pumila cultivar 'Aurescens' was introduced by Georg Dieck at the National Arboretum, Zöschen, Germany circa 1885. Dieck grew the tree from seed collected in the Ili valley, Turkestan (then a region of Russia, now part of Kazakhstan) by the lawyer and amateur naturalist Vladislav E. Niedzwiecki while in exile there.[1][2] Dieck originally named the tree U. pinnato-ramosa f. aurescens.[3]

Description[edit]

'Aurescens' is distinguished by its golden leaves on emergent shoots in spring; the foliage reverts to dark green by summer.[1] The tree is otherwise identical to 'Pinnato-ramosa'.

Pests and diseases[edit]

This cultivar has not been scientifically tested for Dutch elm disease resistance, however several old specimens have survived unscathed by the disease in the UK. (see Notable trees).

Cultivation[edit]

The tree is rare in Europe and unknown in North America and Australasia. In trials in England, it quickly perished where grown on winter-waterlogged ground.[4]

Notable trees[edit]

Two mature specimens are known in the UK: one at Bute Park Arboretum, Cardiff, planted c. 1980, height 15 m × 65 cm d.b.h. in 2004; another grows in a private garden at Seaford, East Sussex (see Accessions).[5]

Accessions[edit]

Europe

Nurseries[edit]

Europe[edit]

References[edit]

  1. ^ a b Dieck, G. (1894). Neuheiten-Offerten des National-Arboretums zu Zöschen bei Merseburg, 1894/95.
  2. ^ Hansen, N. How to produce that $1000 premium apple, in Minnesota State Hort. Soc. (1900). Trees, fruits & flowers of Minnesota. Vol. 28. 470-1. Forgotten Books, London, 2013. ISBN 9781153197953
  3. ^ Green, Peter Shaw (1964). "Registration of cultivar names in Ulmus". Arnoldia. Arnold Arboretum, Harvard University. 24 (6–8): 41–80. Retrieved 16 February 2017. 
  4. ^ Brookes, A. H. (2015). Great Fontley Elm Trial, 2015 Report. Butterfly Conservation, Lulworth, UK.
  5. ^ Johnson, O. (ed.). (2011). Champion Trees of Britain & Ireland. p. 171. Royal Botanic Gardens, Kew, London. ISBN 978-1842464526
  6. ^ "List of plants in the {elm} collection". Brighton & Hove City Council. Retrieved 23 September 2016.