| Ulmus 'Nanguen' | |
|---|---|
 Lutèce aged 20 years, Great Fontley, UK | |
| Genus | Ulmus |
| Hybrid parentage | 'Plantyn' × ('Bea Schwarz' × 'Bea Schwarz' selfed) |
| Cultivar | 'Nanguen' = Lutece |
| Origin | Wageningen, The Netherlands |
Ulmus 'Nanguen' (selling name Lutèce) is a complex fourth generation Dutch hybrid cultivar raised at the Dorschkamp Research Institute for Forestry & Landscape Planning, Wageningen. Lutèce was derived from the cross 'Plantyn' × ('Bea Schwarz' selfed [clone '336'][1]), an ancestry comprising four field elms (U. minor), a wych elm (U. glabra), the curious Exeter Elm ('Exoniensis'), and a frost-resistant selection of the Himalayan elm (U. wallichiana). [2]
Originally identified as clone '812', Lutèce was not promoted by the Dutch owing to unfounded fears that it may prove susceptible to coral spot fungus (Nectria cinnabarina). Instead, patent for '812' was acquired by the French Institut National de la Recherche Agronomique (INRA), which subjected the tree to 20 years of field trials in the Bois de Vincennes, Paris, before release in 2002 as 'Nanguen' = Lutèce.[3][4] Lutèce has been deemed the modern cultivar most closely resembling the native European elms.[5]
Unlicenced propagation of Lutèce is prohibited under Certificat d'Obtention Végétale (COV) EU 17197 until its expiry on 31 December 2036.
- ^ Tijdgat, M. (2020): Ulmus – Gebruikswaarde- en sortimentsonderzoek in de praktijk. Dendroflora Nr. 56-2020, pages 98-99. Koninklijke Vereniging voor Boskoopse Culturen & Nederlandse Dendrologische Vereniging
- ^ Butterfly Conservation (2023). Disease-resistant elm cultivars [1], Butterfly Conservation, Lulworth, England.
- ^ "Ulmus LUTECE® 'Nanguen'". Sapho.fr. Retrieved 29 March 2022.
- ^ "Forest Health in France 2002" (PDF). Paris, France: Department of Forest Health.
- ^ Hillier, J. G. & Lancaster, R. (Eds). (2014). The Hillier Manual of Trees and Shrubs, 8th revised edition. Royal Horticultural Society; London. ISBN 978-1907057472