Ulmus × hollandica

Infobox Cultivar | name = "Ulmus" × "hollandica"
hybrid = "U. glabra" × "U. minor"
origin = Europe "Ulmus" × "hollandica" Mill. is a natural hybrid between Wych Elm "Ulmus glabra" and Field Elm "Ulmus minor" that commonly occurs across Europe wherever the ranges of the two parent species overlap. It has also been widely planted elsewhere by Man Bean, W. J. (1981). "Trees and shrubs hardy in Great Britain", 7th edition. Murray, London. ] Elwes, H. J. & Henry, A. (1913). "The Trees of Great Britain & Ireland." Vol. VII. pp 1848-1929. Private publication, Edinburgh. ] Richens, R. H. (1983). "Elm". Cambridge University Press.] .

Description

The trees and leaves are broadly intermediate between the two species, but resistance to Dutch elm disease is often greater than either's Burdekin, D. A. & Rushforth, K. D. (Revised by Webber J. F. 1996). Elms resistant to Dutch elm disease. "Arboricultural Research Note 2/96". Arboricultural Advisory and Information Service, Alice Holt, Farnham, UK.] Collin, E. (2001). Elm. In Teissier du Cros (Ed.) (2001) "Forest Genetic Resources Management and Conservation. France as a case study". Ministry of Agriculture and Fisheries, Bureau of Genetic Resources. INRA DIC. France. ] .

Pests and diseases

Some examples of the hybrid possess a moderate resistance to Dutch elm disease.

Cultivation

Introduced to North America and Australasia, many old trees still survive in New Zealand, notably in Auckland, the finest considered to be the specimen found outside the Ellerslie Racecourse Auckland Botanical Society (2003). "Journal" Vol. 58 (1), June 2003. ISSN 0113-41332 ] .

Cultivars

At least 30 cultivars have been recorded, although over half have now been lost to cultivation:
*Alba, Angustifolia, Belgica (Belgian Elm), Cinerea, Dampieri, Dauvessei, Daveyi (Davey Elm), Dumont, Eleganto-Variegata, Fjerrestad, Fulva, Gaujardii, Groeneveld, Haarlemensis, Hillieri, Major (Dutch Elm), Macrophylla Aurea, Microphylla, Modiolina, Muscaviensis, Pioneer, Serpentina, Smithii (Downton Elm), Superba (Canterbury Elm), Tricolor, Vegeta (Huntingdon Elm) / Vegeta (Chichester Elm), Virens (Kidbrook Elm), Viscosa, Wredei (Golden Elm), Ypreau.

Accessions

North America

*Arnold Arboretum acc. nos. 325-81, 7614, 92-38
*Bartlett Tree Experts acc. nos. 1245, 1246
*New York Botanical Garden 508/79
*Niagara Parks Botanical Gardens acc. no. 940414

Europe

*Sir Harold Hillier Gardens, UK, acc. no. 1977.0615

Australasia

*Eastwoodhill Arboretum [http://www.eastwoodhill.org.nz/gardens--collection/collection.aspx?Type=&G=Ulmus] , Gisborne, New Zealand, 24 trees, details not known.
*Waite Arboretum [http://www.waite.adelaide.edu.au/arboretum/] , University of Adelaide, Adelaide, Australia, acc. nos. 368, 339

Nurseries

North America

None known.

Europe

*Boomwekerijen 'De Batterijen' [http://www.treecommerce.com/batterijen/resultaten_pagina.asp?page=10&Taal=&ZoekPlant=Ulmus&ZoekCons=&Groep=&Sortering=] , Netherlands.

Australasia

*Fleming's Nursery [http://www.flemings.com.au/] , Monbulk, Victoria, Australia

References