Pseudanthus divaricatissimus is a flowering plant in the family Picrodendraceae and grows in scattered locations in central New South Wales and Tasmania.

Pseudanthus divaricatissimus is a small decumbent or spreading shrub with stems up to 20 cm (7.9 in) long that are smooth to minutely covered with short, hard hairs.

Flowering occurs in spring and the fruit is an oval-shaped capsule 4–4.5 mm (0.16–0.18 in) long, smooth and speckled red and green.

[3] In 1873 George Bentham changed the name to Pseudanthus divaricatissimus and published the description in Flora Australiensis.

[4][5] Pseudanthus divaricatissimus grows on sandy soils in rocky locations from Muswellbrook to Bega, Urbenville and Dubbo also in Tasmania.