The stamen bundles are pale yellow brown to red, 7–12 mm (0.3–0.5 in) long and hairy near the base.

There are 3 stamens in each bundle and the free parts are bright red, 3–7 mm (0.1–0.3 in) and separate at a single point.

Flowering occurs from September to January and is followed by fruit which are woody capsules, 10 mm (0.4 in) long and wide, joined in bundles.

[3][2] Beaufortia macrostemon was first formally described in 1839 by the English botanist John Lindley in A Sketch of the Vegetation of the Swan River Colony.

[2][7] Beaufortia macrostemon is classified as "not threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions.