Gladiolus leptosiphon of the Swartberg Mountains, the Baviaanskloof Mountains and the Kouga Mountains is a slender herb, somewhat threatened by the spread of farming activities.
The cream flowers have red-purple stripes on the three narrow lower tepals and blue-purple anthers against the inside of the recurving dorsal tepal. The corolla tube is elongated. t
The plant's long, narrow leaves are whip-like (Vlok and Schutte-Vlok, 2015; Goldblatt and Manning, 1998; iNaturalist).