The paired leaves of Erepsia forficata are decussate and spaced up the pale, smooth stems, the pairs slightly fused at the base.
The leaves are thickly succulent and acutely three-angled due to their keeled backs that curve in at the tips. Fine, white or red ridges are pale, sometimes translucent along the leaf body edges. The leaf-tips have small horny protrusions, some of those in picture purplish red and out-curving. The green surfaces are smooth with a waxy layer and scattered, translucent surface dots.
The flowers grow solitary from stem-tips on short stalks without bracts, the calyx five-lobed. The narrow, straight petals are pink, purple or occasionally white, arranged in several whorls, some of the inner ones progressively shorter.
The flower centre is nearly white to cream or pale yellow. There are staminodes around the stamens in the flower centre. The ovary surface is hollow. There are nectar glands in the flower base.
The fruit capsule is woody and funnel-shaped with five locules (Smith, et al, 1998; iNaturalist).