Ulmus × hollandica
Native to (or naturalized in) Oregon:
- Deciduous tree, a collection of hybrids of U. minor (syn. U. carpinifolia, U. procera) × U. glabra, and possibly others. Often the some 20 or so cultivars in this group look intermediate between the parent species, although selections may range in habit from tall, narrow or broad, to globose dwarf forms. Jacobson (1996) describes them as having hairless or sparsely hairy twigs, leaf undersides have inconspicuous to moderately obvious hair tufts, and vein pairs number (13)14-17(21). Some consider Ulmus × hollandica ‘Hollandica’ as the "type" cultivar of the cross. It is known as the Dutch Elm or Holland Elm in England and the English Elm in Holland, it originated in 1680 (Jacobson, 1996).
- Sun. Many are susceptible to Dutch Elm Disease (DED) but some are listed as resistant.
- Hardy to USDA Zone (4)5
Only a few of the cultivars of this hybrid are available in the U.S., they include:
- ‘Jacqueline Hillier’ (syn. U. elegantissima ‘Jacqueline Hillier’) - a slow growing rounded, densely branched shrub that grows to a height and width of about 8 ft (2.5 m). Can be grown in a container and as a bonsai.
- ‘Pioneer’ - hybridized in 1971, released by the USDA, highly resistant to DED, crown densely round to oval, fast growing.
- ‘Vegeta’ [Huntingdon Elm] - tall, with a short trunk that is usually forked, leaves light green, 7.5-15 cm long. May be the most popular older clone of U. × hollandica sold in North America (Jacobson, 1996).
- ‘Wredei’ [Golden Elm] - originated in Germany about 1875. Narrow pyramidal crown, to 60 ft (18 m), leaves bright gold, shiny, small but wide.
- Oregon State Univ. campus: the "Elm Walk" on lower campus, between 11th and 15th St., cultivar unknown.
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