''Changiostyrax'' is a monotypic genus of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed with ...

in the family

Styracaceae The Styracaceae are a small family of flowering plants in the order Ericales, containing 12 genera and about 160 species of trees and shrubs. The family occurs in warm temperate and subtropical regions of the Northern Hemisphere. The family is ...

. Its only member species is ''Changiostyrax dolichocarpus'', formerly known as ''Sinojackia dolichocarpa''.Chen CT. 1995. ''Changiostyrax'', a new genus of Styracaceae from china. ''Guijaia'' 15: 289-292. It is

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

to central

China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...

Hunan Hunan is an inland Provinces of China, province in Central China. Located in the middle reaches of the Yangtze watershed, it borders the Administrative divisions of China, province-level divisions of Hubei to the north, Jiangxi to the east, Gu ...

province, where it occurs at altitudes of 400–500 m. It is threatened by

habitat loss Habitat destruction (also termed habitat loss or habitat reduction) occurs when a natural habitat is no longer able to support its native species. The organisms once living there have either moved elsewhere, or are dead, leading to a decrease ...

.Flora of China
''Sinojackia dolichocarpa''
/ref> An exhaustive survey of its range during the decade from 1995 to 2005 revealed only six extant populations, one of which has since been destroyed.Yao X., Qigang Y., Kang M. and H. Huang. 2007. Microsatellite analysis reveals interpopulation differentiation and gene flow in the endangered tree ''Changiostyrax dolichocarpa'' (Styracaceae) with fragmented distribution in central China. ''New Phytologist'' 176: 472-480. It is a small

deciduous In the fields of horticulture and botany, the term deciduous () means "falling off at maturity" and "tending to fall off", in reference to trees and shrubs that seasonally shed Leaf, leaves, usually in the autumn; to the shedding of petals, aft ...

tree In botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, e.g., including only woody plants with secondary growth, only ...

growing to 10–12 m tall. The

leaves A leaf (: leaves) is a principal appendage of the stem of a vascular plant, usually borne laterally above ground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, stem, ...

are alternate, simple, 8–13 cm long and 3.5–4.8 cm broad, oblong-lanceolate, with a serrated margin and a 4–7 mm petiole.

References

{{Taxonbar, from1=Q15089691, from2=Q15327045, from3=Q2894831 Styracaceae Flora of China Monotypic Ericales genera