Ulmus × hollandica 'Pitteurs'

''Ulmus'' × ''hollandica'' 'Pitteurs' or 'Pitteursii', one of a number of hybrid cultivars arising from the crossing of the Wych Elm ''Ulmus glabra'' with a variety of Field Elm ''Ulmus minor'', was first identified by Morren as ''l'orme Pitteurs'' (1848). Elwes and Henry (1913) and Krüssmann (1976) listed it as an ''Ulmus'' × ''hollandica'' cultivar. It was named after the landowner Henri Bonaventure Trudon de Pitteurs of Saint-Trond, near Liège, Belgium, who discovered and first propagated the tree on his estate.

Description

'Pitteurs' was a tall tree, chiefly distinguished by its large, rounded, convex leaves, < 20 cm long by < 19 cm broad, a little attenuate at the apex and with prominent venation. Kirchner and Petzold, describing a tree by that name from the Royal State Tree Nursery at Sanssouci, noted (1864) that the slightly glossy dark green leaves were obtuse-toothed, and appeared reddish-brown when they unfolded. Aigret, however, reported (1905) that the specimen in the Jardin Botanique de Liège, planted in Morren's time, did not match Morren's description, having leaves of ordinary ''U. montana'' sed both for wych and for ''Ulmus'' × ''hollandica''dimensions, and being more elongated and acuminate than those described. This suggests that Morren's measurements for 'Pitteurs', like his measurements for 'Superba', may have been based on the largest of long-shoot leaves.

Ulmus_'Pitteurs',_Morren_1851.jpg, Long shoots of 'Pitteurs': a playful drawing from Morren, also picturing H. B. T de Pitteurs (?), who on the scale of 20-cm leaves would be little over 1 m tall

Cultivation

Reputedly one of two varieties grown from seed obtained in 1845 by Henri de PitteursSchelev, A. (1854) ''Annuaire statistique et historique belge'', page 325, Brussel - Leipzig of Sint-Truiden or Saint-Trond, near Liège, Belgium, the tree was planted on his estate and along roadsides in the region. Gillekens noted in 1891 that in the areas of Liège and Limbourg, 'Pitteurs' was preferred to 'Belgica'. Augustine Henry (1912) thought the tree, which produced shoots growing almost one metre a year, probably identical with those called ''orme Saint-Trond'' he saw at Looymans' nursery at Oudenbosch, which he considered perhaps identical when young to a variety of ''Ulmus montana'' occasionally sold as var. ''macrophylla''. An elm said to be similar and also cultivated on the Pitteurs estate was 'Folia Rhomboidea'.

'Pitteurs' was distributed as ''Ulmus campestris Pittersii'' by the Baudriller nursery, Angers. The Späth nursery of Berlin sold an elm which they said went by the name of 'Pitteurs' in some nurseries but which they themselves called ''U. hollandica''.Späthbuch 1720-1920, p.263
/ref> They continued to distribute it till the late 1930s. A specimen stood in Cantons Park, Baarn, in the interwar period. The Hesse nursery of Weener, Germany, marketed 'Pitteurs' in the 1930s as ''Ulmus latifolia'', adding " = ''U. hollandica'' or ''U. pitteursi'' ", and in the 1950s as ''U. hollandica pitteursi''.

The ''Ulmus gras'' introduced to the USA c.1871, "a fine pyramidal-growing variety", distinguished in catalogues from 'Belgica', may have been ''Orme gras'' ('Pitteurs'). It was later renamed ''Ulmus montana grassei'' by some nurseries. 'Pitteurs' was present in the Arnold Arboretum, Massachusetts, in the interwar years.

In 1998 an unsuccessful search of the de Pitteurs-Hiegaerts Estate (now in the public domain and known as the Speelhof park) was mounted in an attempt to rediscover the elm.Driesen, W. (2008), Stedelijke bibliotheek de Leidrad, Sint-Truiden It is assumed the cultivar fell victim to Dutch elm disease, as did thousands of other elms in the same district. However, 'Pitteurs' was known to have been marketed (as ''U. montana'' 'Pitteursi') in Poland in the 19th century by the Ulrich nursery,Ulrich, C. (1894), ''Katalog Drzew i Krezewow, C. Ulrich'', Rok 1893–94, Warszawa Warsaw, and so may still survive in Eastern Europe. Several trees were thought to survive in England, in the Brighton area.Johnson, Owen (ed.) (2003). ''Champion Trees of Britain & Ireland''. Whittet Press, . 'Pitteurs' is not known to have been introduced to North America or Australasia.

File:Ulmus hollandica (Pitteursii einiger Baumschulen). Hollandischer Ruster.jpg, Späth's ''U. hollandica'', "known as 'Pitteurs' in some nurseries" (1920).
File:Benjamin Wilhelmus Stomps, Afb 010162000349.jpg, Young 'Pitteurs', Bloemgracht, Amsterdam, c.1900 (photo Benjamin Wilhelmus Stomps)

Putative specimens

A pruned ''U. × hollandica'' with large, rounded, convex leaves, and obtuse teeth, exactly matching Morren's 1848 leaf-drawing of 'Pitteurs', stands in Portland Road, Hove (2016).

File:BH00043 Ulmus. Portland Avenue, Hove. (5).jpg, Portland Road tree, Hove (2004)
File:BH00043_Ulmus._Portland_Avenue,_Hove._(6).jpg, Long-shoot leaves of Portland Road tree
File:BH00043_Ulmus._Portland_Avenue,_Hove._(7).jpg, Long- and short-shoot leaves of Portland Road tree
File:BH00043 Ulmus. Portland Avenue, Hove. (2).jpg, Pressed leaves of Portland Road tree
File:BH00043 Ulmus. Portland Avenue, Hove. (3).jpg, Pressed leaves of Portland Road tree
File:BH00043 Ulmus. Portland Avenue, Hove. (8).jpg, Bark of Portland Road tree

A second tree, also pruned, in Hove Recreation Ground, has leaves matching a Royal Botanic Garden Edinburgh 1903 'Pitteurs' herbarium specimen.data.rbge.org.uk, specimen E00824745
/ref>

File:BH00031 Ulmus. Hove Recreation Ground, Hove. (8).jpg, Hove Recreation Ground tree (2013)
File:BH00031 Ulmus. Hove Recreation Ground, Hove. (2).jpg, Pressed leaves of Hove Recreation Ground tree
File:BH00031 Ulmus. Hove Recreation Ground, Hove. (1).jpg, Pressed leaves of Hove Recreation Ground tree
File:BH00031 Ulmus. Hove Recreation Ground, Hove. (3).jpg, Pressed leaves of Hove Recreation Ground tree
File:BH00031 Ulmus. Hove Recreation Ground, Hove. (4).jpg, Bark of Hove Recreation Ground tree
File:Putative Ulmus × hollandica 'Pitteurs' (before 1987).jpg, Extra Mural Cemetery tree, Brighton, blown down in 1987

A putative specimen in the Extra Mural Cemetery in Brighton, was blown down in the Great Storm of 1987 (see gallery).

Accessions

None known.

Hybrid cultivars

'Pitteurs' was crossed with other ''Ulmus × hollandica'' in the Dutch elm breeding programme before World War II, but none of the progeny were retained.Went, J. C. (1954). The Dutch elm disease - Summary of 15 years' hybridisation and selection work (1937–1952). ''European Journal of Plant Pathology'', Vol 60, 2, March 1954.

Synonymy

* l'Orme gras
*?l'Orme St. Trond
*''Ulmus campestris latifolia, foliis rotundata'': Morren, ''Journal d'agriculture pratique'' 4: 509, 511, 1851.
*''Ulmus campestris'' var ''pitteursii'': Wesmael in ''Bulletin de la Fédération des sociétés d'horticulture de Belgique'' 1862: 382, 1863.
*''Ulmus scabra macrophylla'' Hort.: Dieck, (Zöschen, Germany), ''Haupt-catalog der Obst- und gehölzbaumschulen des ritterguts Zöschen bei Merseburg'' 1885 p. 82.

References

{{DEFAULTSORT:Ulmus x hollandica 'Pitteurs'
Dutch elm cultivar
Ulmus articles with images
Ulmus