''Changiostyrax'' is a monotypic genus of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...

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 c ...

. 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 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 found elsew ...

to central

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...

Hunan Hunan (, ; ) is a landlocked province of the People's Republic of China, part of the South Central China region. Located in the middle reaches of the Yangtze watershed, it borders the province-level divisions of Hubei to the north, Jiangxi to ...

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

habitat loss Habitat destruction (also termed habitat loss and habitat reduction) is the process by which a natural habitat becomes incapable of supporting its native species. The organisms that previously inhabited the site are displaced or dead, thereby ...

.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 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, including only woody plants with secondary growth, plants that are ...

growing to 10–12 m tall. The

leaves A leaf (plural, : leaves) is any of the principal appendages of a vascular plant plant stem, stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", wh ...

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