[6] It has an oily grey-green to red-brown smooth bark and angular branchlets with pith oil glands.

[2] Each simple, axillary conflorescence is composed of three to seven flowered umbellasters on narrowly flattened or angular peduncles.

[7] The species name annulata is taken from the latin word annulatus meaning marked with a ring or ringlike which refers to the disc of the fruit.

It is related to the gimlets (series Contortae) by the similar habit and type of bark as well as the large exserted valves of the fruit.

It is most closely related to two mallet species E. protensa and E. extansa both of which are found in the north-eastern part of its range.