Siphonodon australis, also known as ivorywood or scrub guava, is a species of plant in the bittersweet family. It is native to north-eastern Australia.
The species grows as a tree up to 30 m in height. The leaves are 4.5âÂÂ12 cm long by 2.5âÂÂ2.5 cm wide. The small white flowers grow as a 1âÂÂ3 flowered inflorescence 10âÂÂ20 mm long. The hard yellow fruits are about 2.5âÂÂ4 cm long and contain 6âÂÂ2.5 mm seeds.
The species is found in north-eastern and south-eastern Queensland, extending into north-eastern New South Wales. It occurs in drier rainforest and monsoon forest from sea level to an elevation of 900 m.