Ulmus pumila 'Hansen'

The Siberian elm cultivar Ulmus pumila 'Hansen' is a little-known American tree of obscure origin, possibly raised from seed collected by the horticulturist and botanist Prof. Niels Hansen during his expedition to Siberia in 1897.[1]

Ulmus pumila 'Hansen'
'Hansen', Brighton, UK
Species	Ulmus pumila
Cultivar	'Hansen'
Origin	Not known

Description

Very similar to the species.[2] A specimen planted in 1978 at the Sir Harold Hillier Gardens in England had attained a height of 8 m by 2002.

• 
  Leaves of 'Hansen'
• 
  'Hansen' at Hillier Arboretum

Cultivation

The tree's current status in North America is not known; at least three mature specimens survive in the UK. Significantly, it is not listed in Green's digest of elm cultivar names published in 1964, suggesting a rather belated introduction to commerce.[3]

Pests and diseases

See under Ulmus pumila.

Synonymy

• ?'Hansen's Hybrid': Jewell Nursery (ceased trading 2001), Lake City, Minnesota, United States. Wholesale Price List, Fall, 1968 - Spring 1969, p 6, described as "with larger leaf than Chinese (Elm)", but without provenance details.

Accessions

Europe

• Brighton & Hove City Council, UK, NCCPG Elm Collection.[4]
• Sir Harold Hillier Gardens, UK. Acc. no. 1978.1606
• Winkworth Arboretum, Surrey, UK. Tree planted 1975, plot K 37.

References

1. 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
2. Santamour, Frank S.; Bentz, Susan E. (May 1995). "Updated Checklist of Elm (Ulmus) Cultivars for use in North America". Journal of Arboriculture. 21 (3): 122–131. Retrieved 20 June 2016.
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. "List of plants in the {elm} collection". Brighton & Hove City Council. Retrieved 23 September 2016.