It is an erect, multistemmed shrub or shrublet with linear to narrowly oblong leaves and pink flowers arranged in pairs in leaf axils, with 35 to 60 stamens.

The sepal lobes are egg-shaped almost round, 2–3 mm (0.079–0.118 in) long and pale pink with glands in the centre.

[2][3][4] This species was first formally described in 1837 by Stephan Endlicher in Enumeratio plantarum quas in Novae Hollandiae ora austro-occidentali ad fluvium Cygnorum et in sinu Regis Georgii collegit Carolus Liber Baro de Hügel who gave it the name Leptospermum robustum from specimens collected by Hugel near the Swan River.

[7] Hypocalymma robustum grows in woodland in gravelly lateritic and sandy soils in undulating terrain from near Bindoon to Pemberton, including Perth and the Leeuwin-Naturaliste National Park in the Jarrah Forest, Swan Coastal Plain and Warren bioregions of south-western Western Australia.

It requires good drainage and prefers a sunny or partially shaded position and has moderate frost resistance.