Ulmus glaucescens var. lasiocarpa

Ulmus glaucescens var. lasiocarpa Rehder, named the hairy-fruited glaucescent elm in the United States, is a Chinese tree found along rivers and mountain slopes at elevations of 2500–2600 m in the provinces of Hebei, Henan, Liaoning, Nei Mongol, Ningxia, eastern Qinghai, and Shanxi.

Ulmus glaucescens var. lasiocarpa
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Rosales
Family:	Ulmaceae
Genus:	Ulmus
Species:	U. glaucescens
Variety:	U. g. var. lasiocarpa
Trinomial name
Ulmus glaucescens var. lasiocarpa Rehder

Description

The variety is distinguished by a "samara densely pubescent when young, with scattered hairs when mature. Fl. and fr. March–May.".[1]

Pests and diseases

The tree was heavily damaged by the elm leaf beetle Xanthogaleruca luteola in trials in Oklahoma.[2]

Cultivation

There are no known cultivars of this taxon, nor is it known to be in commerce.

Accessions

North America

• Morton Arboretum, US. Acc. no. 537-76: two trees raised from seed sent by the Beijing Botanical Garden, one in the China garden, central section, another along the Du Page River.
• United States National Arboretum, Washington, D.C., US. Acc. no. 76255.

Europe

• Grange Farm Arboretum, Lincolnshire, UK. Two grafted trees from cuttings ex Morton. Acc. no. 700.

Australasia

• Mount Lofty Botanic Garden, Piccadilly, Australia. One tree, raised from seed sent by the Beijing Botanical Garden, planted out c. 1984, 4.5 m high, d.b.h. 13 cm in 2008.

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.
2. "Elm Leaf Beetle Survey". Archived from the original on 2011-07-19. Retrieved 17 July 2017.