Pelargonium tetragonum flowers

An inflorescence of Pelargonium tetragonum usually consists of two flowers. The flower has features typical of several other local species in its broader genus, as can be seen from some pictures in this Album. The bigger upper petals have fine dark lines in their lower, narrow sections. These lines disappear into the light colour of the broader, sometimes lobed upper petal parts. 

The lower petals, usually two and not three of them, as commonly found in many Pelargonium species, share the creamy white or pale pink base colour of the upper two, but without the line markings. They do, however, have outwardly curving and slightly widening, tongue-like tips, similarly recurving as the upper petals. The maroon coloured stamens protrude markedly in a bunch that curves upward about halfway along its length. There are narrow and short, sharply pointed, green sepals pointing outwards from the flower base (Euston-Brown and Kruger, 2023; Vlok and Schutte-Vlok, 2015; Bond and Goldblatt, 1984; iNaturalist).