Ulmus 'Fuente Umbria'
The cultivar ''Ulmus'' 'Fuente Umbria' was raised from seed collected in 1995 from an elm resembling ''Ulmus minor'' growing in a field at Fuente Umbria west of Valencia (), by researchers at the Escuela Técnica Superior de Ingenieros de Montes, Universidad Politėcnica de Madrid. 'Fuente Umbria' is one of seven cultivars found to have a very high resistance to Dutch Elm Disease, on a par with, if not greater than, the hybrid (biology), hybrid cultivar Ulmus 'Sapporo Autumn Gold', 'Sapporo Autumn Gold'. However, retrospective DNA analysis has revealed that the clone has ''Ulmus pumila'' DNA, the species introduced to Spain at the end of the 16th century, and has consequently been dropped from the programme.Brookes, A. H. (2020). ''Great Fontley Elm Trial, 2020 Report''. Butterfly Conservation, Lulworth, UK. 'Fuente Umbria' was introduced to the UK in 2017, by Hampshire & Isle of Wight Branch, ''Butterfly Conservation'', as part of an assessment of DED-resistant cultivars as pot ...
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Cultivar
A cultivar is a type of cultivated plant that people have selected for desired traits and when propagated retain those traits. Methods used to propagate cultivars include: division, root and stem cuttings, offsets, grafting, tissue culture, or carefully controlled seed production. Most cultivars arise from purposeful human manipulation, but some originate from wild plants that have distinctive characteristics. Cultivar names are chosen according to rules of the International Code of Nomenclature for Cultivated Plants (ICNCP), and not all cultivated plants qualify as cultivars. Horticulturists generally believe the word ''cultivar''''Cultivar'' () has two meanings, as explained in ''Formal definition'': it is a classification category and a taxonomic unit within the category. When referring to a taxon, the word does not apply to an individual plant but to all plants that share the unique characteristics that define the cultivar. was coined as a term meaning "cultivated variety ...
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