Strychnos psilosperma, known as the strychnine tree or threaded boxwood, is a shrub or small tree endemic to New South Wales and Queensland in Australia.

The bark is grey, with glossy pointed leaves creating a thick canopy.

Small white, scented flowers occur in the warmer months.

Fruit are orange to red berries, ripening to black.

It may be grown in full sun with good drainage.