''Ulmus pseudopropinqua''
Wang & Li, occasionally known in the United States as the Harbin spring elm, is a small
deciduous tree found only in
Heilongjiang, the northeasternmost province in China.
[Fu, L., Xin, Y. & Whittemore, A. (2002). Ulmaceae, in Wu, Z. & Raven, P. (eds) ''Flora of China'', Vol. 5 (Ulmaceae through Basellaceae). Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, USA]
/ref> The tree has not been studied comprehensively, and it has been speculated it may be a natural hybrid (biology), hybrid of ''Ulmus davidiana'' var. ''japonica'' and ''Ulmus macrocarpa
''Ulmus macrocarpa'' Hance, the large-fruited elm, is a deciduous tree or large shrub endemic to the Far East excluding Japan. It is notable for its tolerance of drought and extreme cold and is the predominant vegetation on the dunes of the Khorc ...
''.[Liou, T. N. (Ed.) (1955). ''Illustrated flora of the ligneous plants of north east China''. Academic Press, Beijing. (in Chinese)]
Description
Regarded as a handsome tree, ''U. pseudopropinqua'' grows to a height of 10 m. The wing-less twigs bear small ovate
Ovate may refer to:
*Ovate (egg-shaped) leaves, tepals, or other botanical parts
*Ovate, a type of prehistoric stone hand axe
*Ovates, one of three ranks of membership in the Welsh Gorsedd
*Vates
In modern English, the nouns vates () and ovat ...
to subovate dark-green leaves, < 5.5 cm long by 2.5 cm broad considered similar to those ''U. davidiana'' var. ''japonica''.[ The wind-pollinated apetalous flowers are produced on second-year shoots in April; the variably-shaped samarae < 25 mm long by 20 mm wide ripen in June.][
]
Pests and diseases
Resistant to Dutch elm disease,[Ware, G. (1995). Little-known elms from China: landscape tree possibilities. ''Journal of Arboriculture'', (Nov. 1995). International Society of Arboriculture, Champaign, Illinois, US]
''U. pseudopropinqua'' has also been found to be among the least suitable species for feeding and reproduction by elm leaf beetle '' Xanthogaleruca luteola'
Popillia japonica
The Japanese beetle (''Popillia japonica'') is a species of scarab beetle. The adult measures in length and in width, has iridescent copper-colored elytra and a green thorax and head. It is not very destructive in Japan (where it is control ...
''
Cultivation
The species is one of a range of rare Chinese elms evaluated as landscape plants at the Morton Arboretum, Illinois. One example is known to grow in the UK, but is not known to have been introduced to continental Europe or Australasia. There are no known cultivars of this taxon, nor is it known to be in commerce beyond the United States.
Accessions
North America
* Brenton Arboretum
The Brenton Arboretum is a 141-acre arboretum and public garden in Dallas Center, Iowa, United States, established in 1997. The arboretum displays 175 native Iowa trees and shrubs suitable to the site, as well as many other tree species which can ...
, US. No accession details available
* Morton Arboretum, US. Acc. no. 587-2006. Wild collected in Harbin
Harbin (; mnc, , v=Halbin; ) is a sub-provincial city and the provincial capital and the largest city of Heilongjiang province, People's Republic of China, as well as the second largest city by urban population after Shenyang and largest ...
, China.
* United States National Arboretum, Washington, D.C., US. Acc. no. 73233.
Europe
* Grange Farm Arboretumbr>
Lincolnshire, UK. Acc. no. 1091.
References
External links
efloras.org: ''U. pseudopropinqua'' descriptionefloras.org: ''U. pseudopropinqua'' leaves and fruit illustration (figures 3 to 5)
{{Taxonbar, from=Q2109844
Elm species and varieties
Trees of Asia
Trees of China
Flora of China
Ulmus articles missing images
pseudopropinqua