" Flowers white to pink or mauve, 5-12 mm in diameter, tubular, with 4 petals, and a hinged column 6-8 mm long sensitive to movement, arising from the centre of the flower. Flowers 10–50 up the stems. " This is the description from https://apps.lucidcentral.org/plants_se_nsw/text/entities/stylidium_graminifolium.htm
Colour mutants are often white since it is just 1 genetic locus that determines the colour, as far as I know: see for instance Stypandra glauca Stypandra glauca (Nodding Blue Lily)