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Ulmus 'Louis van Houtte'
''Ulmus'' 'Louis van Houtte' (Syn. ''Ulmus'' 'Vanhouttei') is believed to have been first cultivated in Ghent, Belgium circa 1863.〔Boom, B. K. () (1959), ''Ned. Dendr.'' 1: 158, 1959〕〔Green, P. S. (1964). Registration of cultivar names in Ulmus. ''Arnoldia'', Vol. 24. Arnold Arboretum, Harvard University. ()
〕 It was once thought a cultivar of English Elm ''Ulmus procera'', though this derivation has long been questioned; W. J. Bean called it "an elm of uncertain status".〔Bean, W. J. (1988) ''Trees and shrubs hardy in Great Britain'', 8th edition, Murray, London, p.655〕 It was first mentioned by Deegen in ''Ill. Monatsch. Gartenb.'' 5: 103, 1886. Its dissimilarity from the type and its Belgian provenance make the ''Ulmus procera'' attribution unlikely. The cultivar is named for the Belgian horticulturist and plant collector Louis Benoit van Houtte, 1810–1876.
==Description==
When young, the tree has leaves entirely yellow, a colour retained throughout summer. However, as the tree ages, the colouring begins a gradual reversion to green. The vertically fissured bark of mature trees is unlike that of English elm, with its squarish 'plated' fissuring. 'Louis van Houtte' has smaller leaves than the not dissimilar ''Ulmus glabra'' Lutescens (Golden Wych Elm).
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