Ulmus pseudopropinqua

Taxobox
status = LC
name = "Ulmus pseudopropinqua"
regnum = Plantae
divisio = Magnoliophyta
classis = Magnoliopsida
ordo = Rosales
familia = Ulmaceae
genus = "Ulmus"
species = "U. pseudopropinqua"
binomial = "Ulmus pseudopropinqua"
binomial_authority = Wang & Li

"Ulmus pseudopropinqua" Wang & Li is a small deciduous tree found only in the northeasternmost province of Heilongjiang in China.

Description

The tree grows to a height of 10 m. Its wing-less twigs bear small ovate to subovate leaves, < 5.5 cm long by 2.5 cm broad. The wind-pollinated petal-less flowers are produced on second-year shoots in April; the variably-shaped samarae < 25 mm long by 20 mm wide ripen in June 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. [http://flora.huh.harvard.edu/china/PDF/PDF05/Ulmus.pdf] ] .

Pests and diseases

Resistant to Dutch elm disease, "U. pseudopropinqua" has also been found to be unaffected by the elm leaf beetle "Xanthogaleruca luteola" [http://commons.wikimedia.org/wiki/Xanthogaleruca_luteola] Ware, G. (1995). Little-known elms from China: landscape tree possibilities. "Journal of Arboriculture", (Nov. 1995). International Society of Arboriculture, Champaign, Illinois, USA. [http://www.ces.ncsu.edu/fletcher/programs/nursery/metria/metria8/m87.pdf] ] .

Cultivation

The species is one of a range of rare Chinese elms currently under evaluation as landscape plants at the Morton Arboretum, Illinois, but is not known to have been introduced to Europe or Australasia. There are no known cultivars of this taxon, nor is it known to be available from any nurseries beyond the USA.

Accessions

;North America
*Morton Arboretum, no details available.

Nurseries

;North America
*Sunshine Nursery [http://www.sunshinenursery.com/catalogue.htm] , Clinton, Oklahoma.

References