Ulmus bergmanniana var. lasiophylla explained

Ulmus bergmanniana var. lasiophylla C. K. Schneid. (Hairy-leaved Bergmann's elm) is endemic to China, on mountain slopes at elevations of 2100 - 2900 m in Gansu, Shaanxi, north-west Sichuan, south-east Xizang (formerly Tibet), and north-west Yunnan.^[1]

Description

The tree is distinguished by Fu (2002) as having "Leaf blade adaxially with densely curved pubescence.^[2] Flowers and fruits February - April".^[3]

Cultivation

Var. lasiophylla is cold hardy; in artificial freezing tests at the Morton Arboretum^[4] the LT50 (temp. at which 50% of tissues die) was found to be - 27.7 °C. There are no known cultivars of this taxon, nor is it known to be in commerce.

Accessions

North America

• Chicago Botanic Garden, US. No accession details; planted in West Collections Area.
• Morton Arboretum, US. Acc. no. 45 - 95. Collected from the wild at an unrecorded site in China.
• United States National Arboretum, Washington, D.C., US. Acc. nos. 76218, 68978.

Europe

• Glendoick Gardens, Perthshire, UK; two trees (2017), source 'SSNY 205'.
• Grange Farm Arboretum https://web.archive.org/web/20120314110413/http://www.thegardeningwebsite.co.uk/grange-farm-plants-speciality-rare-trees-shrubs-i411.html, Lincolnshire, UK. Acc. no. 1057.
• Royal Botanic Garden Edinburgh, UK. Acc. no. 19933397. Wild collected in Kunming, China, by Gothenburg Expedition.

External links

• efloras.org: U. bergmanniana var. lasiophylla leaves and fruit illustration
• efloras.org: U. bergmanniana var. lasiophylla description

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. Web site: Herbarium catalogue. Ulmus bergmanniana var. lasiophylla. Board of Trustees of the Royal Botanic Gardens, Kew. 17 October 2016.
3. https://vplants.org/portal/collections/individual/index.php?occid=24480414 Campbell University Herbarium specimen. Sheet labelled U. bergmanniana var. lasiophylla Schneid., flowers from Morton Arboretum (2011)
4. Shirazi, A. M. & Ware, G. H. (2004). Evaluation of New Elms from China for Cold Hardiness in Northern Latitudes. International Symposium on Asian Plant Diversity & Systematics 2004, Sakura, Japan.