The keel crest of a Polygala asbestina flower is usually blue but may also be white. This brush-like protrusion is often the prominent signpost detected by the would-be patron looking for breakfast served by a flower.

The bracts below the flower are deciduous. Up to three flowers grow from a leaf axil raceme. The narrow wing sepals are obliquely oblong with pointed tips (Vlok and Schutte-Vlok, 2015; JSTOR).