- An Australianeuphorbiaceoustree, Petalostigma quadriloculare, the bark which includes a strong bitter concept used medicinally. Also referred to as emu-apple, crab-tree, and local quince.
- just one of two trees of this dogbane family, Tabernæmontana orientalis and Pala constricta (Alstonia constricta of F. von Müller), the barks that may used in medicine. The latter is much better referred to as fever-bark. See additionally Alstonia bark, under bark.
- decorative shrub or tiny tree of swampy places in southwestern united states of america having big green or white sepals and yielding Georgia bark for treating fever