Flindersia australis is a tree that typically grows to a height of , larger trees usually having a
buttressed trunk. The leaves are usually arranged alternately and are crowded near the ends of the branchlets. The leaves usually have between five and nine elliptical to egg-shaped leaflets that are long and wide, the side leaflets on a
petiolule up to long and the end leaflet on a petiolule
sessile or on a petiolule up to long. The flowers are arranged in panicles long and usually include a few male-only flowers. The five
sepals are about long and the five
petals are white to cream-coloured, long and densely hairy on the back and part of the front. Flowering occurs from September to October and the fruit is a woody
capsule long and studded with short, rough points. The seeds are long and winged. ==Taxonomy==