| Ulmus minor sensu latissimo | |
|---|---|
'Hoersholmiensis', Amsterdam. Photo: Ronnie Nijboer, Bonte Hoek kwekerijen. |
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| Details | |
| Cultivar | 'Hoersholmiensis' |
| Origin | Hørsholm, Denmark |
The Field Elm Ulmus minor sensu latissimo cultivar 'Hoersholmiensis' [4] is believed to have originated in the Hørsholm Planteskole, Denmark, circa 1885 and was propagated by the Nielsen nursery in Hørsholm [1].
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The tree has an upright habit and rapid growth. The leaves are lanceolate or narrowly obovate, acuminate at the tip and with a cuneate base, clear green in colour [2], turning a deep yellow in autumn.[3]
'Hoersholmiensis' is susceptible to Dutch elm disease and Coral-spot Fungus Nectria cinnabarina.
Fine specimens can be seen in Stockholm, in Raoul Wallenberg square and the Karlaplan.[4] The tree was planted in the Netherlands, notably along the Westlandsgracht in Amsterdam where it still survives, although upper branches are often killed by Coral-spot Fungus.
The tree was hybridized with 'Commelin' and U. pumila as part of the Dutch elm breeding programme at the De Dorschkamp Institute, Wageningen. Seeds arising from the crossing were donated by Hans Heybroek to the University of Wisconsin-Madison programme in 1960. The clone 'Regal' was a frost-hardy selection from the resultant seedlings, whilst the later 1984 USDA release 'Homestead' arose from the crossing of another with U. pumila.