It is a compact, monoecious shrub with simple, egg-shaped to round leaves and yellow flowers arranged in leaf axils, but appearing clustered on the ends of branches.

Pseudanthus micranthus is a compact, monoecious shrub that typically grows to a height of 10–30 cm (3.9–11.8 in) and is intricately branched.

Flowering has been observed in January and from April to November, and the fruit is an oval capsule 3.5–5.5 mm (0.14–0.22 in) long.

[2][3] Pseudanthus micranthus was first formally described in 1873 by George Bentham in Flora Australiensis from specimens collected near Adelaide by Joseph Whittaker.

[6] Pseudanthus micranthus grows in shrubland, heath and mallee in the Mount Lofty Ranges and on Kangaroo Island in the south-east of South Australia.