The purple anthers of this Pelargonium desertorum flower nearly match the markings on the upper petals in colour. The filaments of the stamens are white. P. desertorum anthers may also be orange in colour. The species produces up to seven fertile stamens, three of them having shorter filaments than the rest.

A pair of dull blotches are present higher up on the upper petals, above the highest of the more sharply outlined markings positioned lower down and closer together. The petal shape is narrowly oblong and longish to oblanceolate with rounded, rectangular, skewed or notched tips.

The flower is about 12 mm in diameter, its pedicel from 2 cm to 3,5 cm long (Williamson, 2010; iNaturalist; www.namibrand.com).