Ulmus davidiana var. davidiana explained

Ulmus davidiana var. davidiana is variety of elm. The tree is restricted to the Chinese provinces of Hebei, Henan, Shaanxi and Shanxi.^[1]

Description

The tree has "Bark pale grey to grey. Samara densely pubescent on seed. Fl. and fr. March - May." The pubescence over the seed distinguishes var. davidiana from var. japonica.^{[1] [2] [3] [4]}

Pests and diseases

No information available, but Ulmus davidiana has a moderate, 3 out of 5 resistance.

Cultivation

The tree is very rare in cultivation beyond China.

Accessions

North America

• U S National Arboretum http://www.usna.usda.gov/index.htm, Washington, D.C., United States. (Listed under synonym U. davidiana var. mandshurica) Acc. nos. 76223, 68982.

Nurseries

Europe

• Pan-global Plants http://www.panglobalplants.com/visiting/, Frampton on Severn, Gloucestershire, UK

Notes and References

1. 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
2. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200006324 U. davidiana var. davidiana description, Flora of China, vol.5 p.7, efloras.org
3. http://www.efloras.org/object_page.aspx?object_id=50126&flora_id=2 U. davidiana var. davidiana fruit and leaves illustration, Flora of China, efloras.org
4. http://www.ulmen-handbuch.de/handbuch/ulmus/u_davidiana_davidiana.html U. davidiana var. davidiana in the Handbuch der Ulmengewächse