It is an open shrub with many densely hairy stems, egg-shaped and lobed leaves and pink and dark red flowers.

The sepals are pink with a dark red to purple base, the lobes 5.7–8.0 mm (0.22–0.31 in) long, and hairy on the back.

[3][4] Lasiopetalum pterocarpum was first formally described in 2006 by Eleanor Marion Bennett and Kelly Anne Shepherd in the journal Nuytsia from specimens collected in Serpentine National Park in 1995.

[4] This lasiopetalum is only known from a single population in Serpentine National Park, where it grows in woodland on sloping banks and near creeks.

[3][4] Lasiopetalum pterocarpum is listed as "endangered" under the Australian Government Environment Protection and Biodiversity Conservation Act 1999[2] and as Threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions,[3] meaning that it is in danger of extinction.