Ulmus changii
From Wikipedia, the free encyclopedia
| Ulmus changii | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Rosales |
| Family: | Ulmaceae |
| Genus: | Ulmus |
| Species: | U. changii |
| Binomial name | |
| Ulmus changii | |
Ulmus changii, occasionally known as the Hangzhou elm, is a small deciduous tree found across much of China in forests at elevations of up to 1800 m.[1] Owing to its increasing scarcity, U. changii was added to the Hainan Province Protected Plants List in 2006.
The tree can reach a height of 20 m with a trunk of about 0.9 m d.b.h; the bark is dark grey. The leaves are generally ovate, < 11 cm long, glabrescent and smooth when mature. The wind-pollinated apetalous flowers are produced on second-year shoots in March - April, the samarae are almost orbicular, < 35 mm in diameter.[1][2]
U. changii foliage, Grange Farm Arboretum
Pests and diseases
Ulmus changii was found to be among the least suitable elms for feeding and reproduction by the adult elm leaf beetle Xanthogaleruca luteola [3] and highly preferred for feeding by the Japanese beetle Popillia japonica[4] in the United States.
Cultivation
Subspecies & varieties
Two varieties are recognized: var. changii L.K.Fu, and var. kunmingensis W.C.Cheng.
Etymology
The tree is named for S. S. Chang, the Chinese botanist who identified the species in 1936.
Accessions
- North America
- Morton Arboretum, Illinois, US. Acc. no. 11 2008. Cuttings grafted onto U. pumila rootstocks, planted out in 2008.
- Asia
- Hangzhou Botanical Garden , Hangzhou, Zhejiang, China. Details not known.
- Europe
- Grange Farm Arboretum, Lincolnshire, UK. Acc. no. 1059. Two trees from cuttings ex. Morton Arboretum on U. glabra rootstocks.