The Radinosiphon leptostachya flower is laterally symmetrical or zygomorphic, its six narrow, unequal tepals attenuating to conspicuous, thread-like tips. Two unequal, point-tipped bracts envelop the flower base. The narrowly cylindrical perianth tube, up to 3 cm long, widens at the flower throat. The variably pale pink to purple pink tepals are lance-shaped, the dorsal or upper one widest and the lower three striped maroon purple in their lower halves.
Three dark, oblong anthers cohere below halfway up the length of the dorsal tepal, the white, three-branched style usually taller behind them (Onderstall, 1996; iNaturalist; JSTOR; https://wildflowernursery.co.za; https://www.pacificbulbsociety.org; https://www.zimbabweflora.co.zw).