The flowers of Monsonia patersonii have rose, pale magenta or purple corollas forming shallow bowls up to 3,5 cm in diameter. The petal surfaces are slightly wrinkled in true Monsonia style.
Young flowers are sometimes more deeply coloured, paling over time under the sun. Old flowers open more widely, faint vein lines visible upon their petal surfaces.
The five oblong stigma branches form a star-shape in the flower centre. They are cream, the fifteen anthers surrounding them yellow. In dry years this plant may flower while remaining leafless or nearly so. Flowering happens from late autumn through winter, the season sometimes extended considerably.
Some long-stalked, ovoid buds are dark in picture, showing prominent seams between their still closed sepals. The pointed sepals of the open flower curve in but away from the base of the corolla; much shorter than it (Williamson, 2010; Manning, 2009; Le Roux, et al, 2005; iNaturalist).