Ulmus pumila var. arborea

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Ulmus pumila var. arborea

Kingdom:	Plantae
Division:	Magnoliophyta
Class:	Magnoliopsida
Order:	Rosales
Family:	Ulmaceae
Genus:	Ulmus
Species:	U. pumila

Trinomial name

Ulmus pumila L. var. arborea
Litv.

Synonyms

Ulmus pinnato-ramosa Dieck
Ulmus turkestanica Regel

U. pumila L. var. arborea Litv. is distinguished by its greater height and pinnate leaves. Endemic to western Siberia and Turkestan, it was introduced to the west by Georg Dieck in 1894, where it became known as U. pinnato-ramosa. The leaves are 4 - 7 cm in length, ovate-lanceolate, double-toothed and finely pointed. Var. arborea grows very vigorously, and can ultimately make a large tree ^[1]. The USA national champion tree in Detroit, Michigan, is 45 m tall, with a crown of 34 m width [1]. In the UK, a specimen at the Ryston Hall [2], Norfolk, arboretum, obtained from the Späth nursery in Berlin before 1914 ^[2], was killed by the earlier strain of Dutch elm disease prevalent in the 1930s. Introduced to Australia, the tree was listed by nurseries there (as turkestanica) in the early 20th century, but it is not known whether it still survives in that country.

There are no known cultivars of this taxon, nor is it known to be available from any nurseries.

[edit] Arboreta etc accessions

North America

Arnold Arboretum acc. nos. 925-83, 698-87.
Holden Arboretum acc. no. 60-317
New York Botanical Garden acc. no. 1032/60

Europe

Hergest Croft Gardens, Kington, Herefordshire, UK. One tree, as U. pinnato-ramosa; no accession details available.
Royal Botanic Garden Edinburgh, acc. nos. 19021007, 20021586
Sir Harold Hillier Gardens, UK, acc. no. 1977.4795, (as U. pinnata-ramosa).
Strona Arboretum [3], University of Life Sciences, Warsaw, Poland
University of Copenhagen Botanic Garden, details not available.