[4] It is an erect, multi-stemmed shrub with narrowly linear leaves, white or pale pink flowers .

Hypocalymma angustifolium is an erect, multistemmed shrub that typically grows to a height of up to 1.5 m (4 ft 11 in).

The flowers are arranged singly or in pairs in leaf axils, and are sessile with short bracts and bracteoles at the base.

[2][5][6][7] Hypocalymma angustifolium was first formally described in 1837 by botanist Stephan Endlicher, who gave it the name Leptospermum angustifolium in Enumeratio plantarum quas in Novae Hollandiae ora austro-occidentali ad fluvium Cygnorum et in sinu Regis Georgii collegit Carolus Liber Baro de Hügel, from specimens collected by Charles von Hügel near the Swan River.

[7] It requires good drainage and prefers a position in partial shade, protected from heat and wind.