Gymnanthemum extensum, also known as bitterleaf tree, Chinese: 展枝斑鸠菊 zhan zhi ban jiu ju, Thai: หนานเฉาเหว่ย nan chao woei, is a species of flowering shrub of the family Asteraceae.

[1] It is an up to 8 m shrub or small tree found naturally growing at 1,200 m (3,900 ft) to 2,100 m (6,900 ft) above sea level in open forests or thickets in slopes, valleys and by the roadside.

[2] Southern China (Guizhou, Yunnan), the Himalayas (Sikkim, Nepal, Bhutan) and the Shan Hills (Myanmar, Thailand).

[2] It has been cultivated in Thailand as a garden tree for the medicinal properties of its leaves and the fragrance of its flowers.

[3]