Ulmus pumila 'Dropmore' explained

The Siberian elm cultivar Ulmus pumila 'Dropmore' http://www.hort.uconn.edu/plants/u/ulmpum/ulmpum1.html was grown from seed collected in Harbin, Manchuria, China, by F. L. Skinner, of Dropmore, Manitoba.^[1] Green reported (1964) a suggestion to merge the Siberian elm cultivars 'Harbin' and 'Manchu' with 'Dropmore', as all came from the Harbin area.^[2] In the event, 'Dropmore' appears to have superseded these earlier cultivars.^[3]

The cultivar 'Chinkota' was raised in North Dakota from 'Dropmore' seed.^[4]

Description

'Dropmore' is a fast-growing bushy form producing small leaves.

See under Ulmus pumila.

The tree remains in commercial cultivation in the United States. Considered cold-hardy far into Canada http://www.northern.edu/natsource/TREESA1/Siberi1.htm, it did not perform well in the hot, arid, climate of Arizona as part of the elm trials in conducted by the Northern Arizona University at Holbrook http://www.for.nau.edu/cms/content/view/512/706/.

http://www.sdgs.usd.edu/naturalsource/flora/treesandshrubs/SiberianElm.pdf 'Siberian Elm', South Dakota Dept. of Agriculture, Forestry Div., Pierre, S.D.; sdgs.usd.edu
https://archive.org/details/arnoldiaarno_21/page/40/mode/2up Arnoldia : Bulletin of the Arnold Arboretum, 24 July 1964, Vol 24 Nos 6-8, pp.40-80
Santamour, Frank S.; Bentz, Susan E. (May 1995). 'Updated Checklist of Elm (Ulmus) Cultivars for use in North America', Journal of Arboriculture. 21 (3); pp.122–131.
Collins, P. E. (1955). Chinkota Elm. South Dakota Farm and Home Research. 7 (1), 14 - 16, 27. South Dakota State University, Brookings, USA.
https://www.cirrusimage.com/tree_Dropmore_Siberian_Elm/ Photographs of Morton Arboretum 'Dropmore', Acc. no. 883-55; cirrusimage.com