Changiostyrax is a monotypic genus of flowering plant in the family Styracaceae. 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 to central China in Hunan province, where it occurs at altitudes of 400–500 m. It is threatened by habitat loss.Flora of China: Sinojackia dolichocarpa 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 tree growing to 10–12 m tall. The leaves 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.
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