''Ulmus glabra'' 'Concavaefolia'

Ulmus glabra 'Concavaefolia'
'Concavaefolia' leaves
Species Ulmus glabra
Cultivar 'Concavaefolia'
Origin Europe

The Wych Elm cultivar Ulmus glabra 'Concavaefolia' is a curled-leaved form now rare in cultivation, and identified from old herbarium specimens labelled U. scabra Mill. [:glabra Huds.] var. concavaefolia. It was also known as the wych 'Cucullata' cultivar (see 'External links').

Not to be confused with the Field Elm cultivars 'Webbiana', which also has up-curling leaves, or 'Concavaefolia', said to resemble field elm 'Cucullata', with down-curling leaves.

Description

Fontaine (1968) described the leaf as folded lengthwise along the midrib, making it more or less tubular.[1] Herbarium specimens (see External links) show an up-curling wych leaf with a shorter petiole, more deeply toothed margin, and more acuminate apex than 'Webbiana' (which also has leaves curled or folded longitudinally). The samara was confirmed by the Royal Botanic Garden Edinburgh in 2017 as U. glabra.[2]

Pests and diseases

Susceptible to Dutch elm disease.

Cultivation

The extent of the tree's cultivation is unknown.

Notable trees

An elm cultivar, with leaves identical to a Haarlem herbarium specimen "formerly called U. glabra Huds. var. concavaefolia",[3] and to a second herbarium specimen from the Poortbulten Arboretum (1929) labelled U. montana cucullata,[4] stood till 2017 (girth 2.8 m) in East Preston Street Cemetery, Edinburgh, before succumbing to DED.[5][6] A second, decayed old tree in Warriston Cemetery, Edinburgh, is the remains (2017) of a U. glabra 'Horizontalis' grafted at 2 m on a stock of the same clone as the East Preston Street Cemetery tree.[7] The stock, now 3 m in girth (2016), flushes before the scion on a few ascending branches and bole shoots. It produces no suckers.

References

  1. ↑ F. J., Fontaine (1968). "Ulmus". Dendroflora. 5: 37–55. Retrieved 30 August 2017.
  2. ↑ Correspondence with RBGE, 2017
  3. ↑ "Herbarium specimen - WAG.1853027". Botany catalogues. Naturalis Biodiversity Center. Sheet described as U. glabra Huds. var. concavaefolia
  4. ↑ "Herbarium specimen - L.1586967". Botany catalogues. Naturalis Biodiversity Center. Sheet described as U. carpinifolia Gled. cv. 'Cucullata' (Loudon), formerly called U. montana cucullata (Poortbulten Arboretum, 1929)
  5. ↑ Google Maps: Dalkeith Road - Google Maps (May 2016), accessdate: October 11, 2016
  6. ↑ Google Maps: Dalkeith Road - Google Maps (Aug 2014), accessdate: October 11, 2016
  7. ↑ The 'Horizontalis' / 'Concavaefolia' stands by the west wall, middle level, of Warriston Cemetery, Edinburgh.
  • "Herbarium specimen - WAG.1853027". Botany catalogues. Naturalis Biodiversity Center. Sheet described as U. glabra Huds. var. concavaefolia
  • "Herbarium specimen - L.1586967". Botany catalogues. Naturalis Biodiversity Center. Sheet formerly called U. montana cucullata (Poortbulten Arboretum specimen, 1929)
  • "Herbarium specimen - L.1587156". Botany catalogues. Naturalis Biodiversity Center. Sheet labelled U. glabra Huds. 'Cucullata' (Arnold Arboretum specimen, 1930)
  • "Herbarium specimen - WAG.1846668". Botany catalogues. Naturalis Biodiversity Center. Sheet labelled U. scabra cucullata
  • "Herbarium specimen BR0000010840566". Botanic Garden, Meise. Juvenile long shoot, labelled U. campestris L. cucullata
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