Ulmus laevis var. celtidea

Ulmus laevis var. celtidea Rogow. is a putative variety of European White Elm first described by Rogowicz,[1] who found the tree in 1856 along the river Dnjepr[2] near Chernihiv in what is now northern Ukraine. The type specimen is held at the National Herbarium of Ukraine.[3] The variety was first named as Ulmus pedunculata var. celtidea.[2] Litvinov (1908) considered it a species, calling it Ulmus celtidea Litv., a view not upheld by other authorities.[4]

Ulmus laevis var. celtidea
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Ulmaceae
Genus: Ulmus
Species:
U. laevis
Variety:
U. l. var. celtidea
Trinomial name
Ulmus laevis var. celtidea
Rogow.

Similar trees were later found near Briansk in Oryol Oblast, but featured larger leaves.[5]

Description

The leaves are oblong-lanceolate, but only about 25 millimetres (1 in) in length, long-acuminate at the apex, and coarsely, sharply serrate, cuneate and sub-equal at the base. The samarae were also notably smaller than the species [6]

Cultivation

One specimen which grew at the Strona Arboretum, University of Life Sciences, Warsaw, Poland, (as Ulmus celtidea Litv.) died circa 2006. The tree was grown from seed collected from a tree at the Arboretum of the Forest-Technical Academy in St. Petersburg in 1961; it is not known whether this source is still alive. No cultivars or hybrid cultivars are known.

Accessions

North America
  • Morton Arboretum, US. Acc. no. 1302-27 Grafts (6) from Arnold Arboretum of Harvard University (received as Ulmus laevis var. celtidea).[4]

Europe
  • Royal Botanic Gardens Wakehurst Place, UK. Acc. no. 1973-21047, as Ulmus laevis var. glabra obtained from a grafted tree grown at Kew now lost; provenance notes of the latter have not survived either.

Synonyms

References
  1. Rogowicz, A. S. (1869). Fl. Kief. 229, 1869.
  2. Heybroek, H. M., Goudzwaard, L, Kaljee, H. (2009). Iep of olm, karakterboom van de Lage Landen (:Elm, a tree with character of the Low Countries). KNNV, Uitgeverij. ISBN 9789050112819
  3. Specimen at the Herbarium of P. Rogowich, National Herbarium of Ukraine Archived 2010-01-28 at the Wayback Machine as Ulmus effusa Will. f. celtidea Rogow.
  4. Rehder, Alfred, 'New Species, varieties ... from the collection of the Arnold Arboretum', Journal of the Arnold Arboretum, vol.19, 1938, p.264
  5. Chitrovo, Bull. Soc. Nat. Orel i. 50, 1907
  6. Elwes, H. J. & Henry, A. (1913). The Trees of Great Britain & Ireland. Vol. VII. pp 1848–1929. Private publication.


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