| 词条 | Ulmus changii | |
| 释义 |
|image = Ulmus changii leaf.jpg |status = VU |status_system = IUCN2.3 |status_ref = |genus = Ulmus |species = changii |authority = W. C. Cheng }} Ulmus changii W. C. Cheng, 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, and classed as 'Vulnerable' by the International Union for the Conservation of Nature (IUCN). DescriptionThe 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] Pests and diseasesUlmus changii was found to be among the least suitable elms for feeding and reproduction by the adult elm leaf beetle Xanthogaleruca luteola [2] and highly preferred for feeding by the Japanese beetle Popillia japonica[3] in the United States. CultivationThe species is extremely rare in cultivation beyond China, although in the US the species is rated hardy enough for USDA zone 5. There are no known cultivars of this taxon, nor is it known to be in commerce. Subspecies & varietiesTwo varieties are recognized: var. changii L.K.Fu, and var. kunmingensis W.C.Cheng. EtymologyThe tree is named for S. S. Chang, the Chinese botanist who identified the species in 1936. Accessions
Nurseries
References1. ^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. {{ISBN|1-930723-40-7}} {{Elm species, varieties, hybrids, hybrid cultivars and species cultivars |state=collapsed}}{{Taxonbar|from=Q5466742}}2. ^{{cite journal|last1=Miller|first1= F.|last2= Ware|first2=G.|year=2001|title=Resistance of Temperate Chinese Elms (Ulmuss spp.) to Feeding of the Adult Elm Leaf Beetle (Coleoptera: Chrysomelidae)|journal=Journal of Economic Entomology|volume=94|issue=1|pages=162–166|doi=10.1603/0022-0493-94.1.162}} 3. ^{{cite journal|last1=Miller|first1=F.|last2=Ware|first2= G.|last3=Jackson|first3= J.|year=2001|title=Preference of Temperate Chinese Elms (Ulmuss spp.) for the Feeding of the Japanese Beetle (Coleoptera: Scarabaeidae)|journal=Journal of Economic Entomology|volume=94|issue=2|pages=445–448|doi=10.1603/0022-0493-94.2.445}} 7 : Ulmus|Endemic flora of China|Trees of China|Flora of Zhejiang|Elm species and varieties|Ulmus articles with images|Vulnerable flora of Asia |
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