The lower three, red-striped, salmon coloured tepals of Gladiolus oppositiflorus are joined in their basal parts. The tepal margins curve elaborately, adding a decorative feature to flower colour and shape.
Several flowers of this species are usually open simultaneously, always starting at the base of the spike.
These slender perianth flowers are pollinated by long-tongued flies of the Prosoeca genus (Goldblatt and Manning, 1998; Manning, 2009; Pooley, 1998; iNaturalist).