Cupaniopsis dallachyi is a species of flowering plant in the soapberry family and is endemic to north-east Queensland. It is a tree with paripinnate leaves with 4 to 14 elliptic to egg-shaped leaflets with domatia along the midrib, separate male and female flowers arranged in panicles, the fruit a brown capsule containing a reddish-brown seed with a brown aril.
Cupaniopsis dallachyi is tree that typically grows to a height of up to, its branchlets sometimes covered with fine, soft, rust-coloured hairs. The leaves are paripinnate with 4 to 14 elliptic to egg-shaped leaflets with the narrower end towards the base, long, wide on a rhachis long. There are usually small domatia along the whole micreb of the leaflets. Separate male and female flowers are borne in panicles. The sepals have more or less round lobes about long. The petals are about long. The fruit is brown and about long and wide containing seeds with a brown aril.[1] [2]
Cupaniopsis dallachyi was first formally described in 1985 by Sally T. Reynolds in the Flora of Australia from specimens collected near Jaggan in 1980.[3] The specific epithet (dallachyi) honours John Dallachy.
This species of Cupaniopsis grows in rainforest from near Daintree to south of Ravenshoe in north Queensland, at altitudes between .