It is a prostrate or low spreading shrub with simple or three-part leaves and white or pale pink four-petalled flowers.Cyanothamnus nanus is a prostrate shrub or one that has weak, spreading branches and grows to about 25 cm (10 in) wide and 50 cm (20 in) high.

Its youngest branches have a few soft hairs but become glabrous as they age.

The flowers are white to pale pink and are arranged singly or in groups of up to three or more in leaf axils, the groups on a peduncle 1–7 mm (0.04–0.3 in) long, individual flowers on a pedicel 2–16 mm (0.08–0.6 in).

[2][3][4] Dwarf boronia was first formally described in 1840 by William Jackson Hooker who gave it the name Boronia nana in Icones Plantarum from a specimen collected by Ronald Campbell Gunn on top of Rocky Cape.

[5][6] In a 2013 paper in the journal Taxon, Marco Duretto and others changed the name to Cyanothamnus nanus on the basis of cladistic analysis.