Ulmus pumila 'Poort Bulten'

The Siberian elm cultivar Ulmus pumila 'Poort Bulten' hails from Arboretum Poort Bulten in Losser, Netherlands. This tree was for many years mistaken for Planera aquatica or 'water elm' and commercially propagated under that name.[1]

Ulmus pumila 'Poort Bulten'
'Poort Bulten' at the Arboretum Poort Bulten, Losser, NL
Species	Ulmus pumila
Cultivar	'Poort Bulten'
Origin	Netherlands

Description

The tree has smaller, paler, green leaves than the type, while the trunk has a very rough bark.[2][3]

Pests and diseases

See under Ulmus pumila.

Cultivation

'Poort Bulten' is not known to have been introduced to North America or Australasia.

Putative specimens

A young Siberian elm with rough bark and leaves smaller than those of 'Pinnato-ramosa', that remain light green all summer, stands near the entrance to Rocheid Path at the northern end of Arboretum Avenue, Edinburgh (2018).[4]

• 
  Possible 'Poort Bulten', Edinburgh
• 
  Same tree, from Arboretum Avenue
• 
  Bole of the same
• 
  Dried leaves of the same (upper surface; colour faded in pressing)
• 
  Lower surface

Synonymy

• Planera aquatica in error.

Accessions

Europe

• Arboretum Poort Bulten , Acc. no. LOS0252, Losser, Netherlands.
• Wijdemeren City Council, Elm Arboretum, 2 trees planted 2019: Brilhoek and Hornhof cemetery, Nederhorst den Berg

Nurseries

Europe

• Noordplant , Glimmen, Netherlands.

Notes

1. Ulmus pumila 'Poort Bulten', Morton Arboretum
2. systematics.mortonarb.org/ulmus/elmCultivar.270.html
3. arboretum-poortbulten.nl/locaties/boom/2636/ulmus-pumila-poort-bulten
4. Tree can be seen on Google Streetview, 'above' steps of 1 Reid Terrace, Edinburgh, or from Arboretum Av., near entrance to Rocheid Path.

External links

• U. pumila 'Poort Bulten', arboretum-poortbulten.nl
• "Herbarium specimen - L.1587208". Botany catalogues. Naturalis Biodiversity Center. Ulmus formerly labelled Planera aquatica (specimen from Zuiderpark, Den Haag, 1955)
• "Herbarium specimen - L.1582326". Botany catalogues. Naturalis Biodiversity Center. Ulmus formerly labelled Planera aquatica (specimen from Hillier & Sons, Winchester, 1952)
• "Herbarium specimen - L.1582325". Botany catalogues. Naturalis Biodiversity Center. Ulmus formerly labelled Planera aquatica (specimen from Arboretum national des Barres, Nogent-sur-Vernisson, 1949)