Alstonia constricta, commonly known as quinine bush or bitterbark, is an endemic Australian endemic shrub or small tree of the family Apocynaceae.
Alstonia constricta has an erect growth form. Growing to 12 m in height. The species is capable of producing adventitious shoots or ‘suckers’ from the root system and in this manner often forms thickets. Leaves are pubescent, narrow and lanceolate, from 5–20 cm in length. Flowers are white to cream, 2– 4 cm across. The bark has a corky textured and develops ...