Marsdenia graniticola P.I.Forst.

Subshrub to 1 m high; latex white. Roots fibrous. Indumentum colourless. Leaves with petiole 2–3 mm long; lamina lanceolate to ovate, to 25 mm long, to 7 mm wide, cuneate at base, obtuse, with scattered to dense trichomes below, not triveined at base; venation prominent below; colleters absent. Inflorescences umbelliform. Flowers 5–7 mm long, 10–11 mm diam.; pedicels 2–3 mm long. Corolla campanulate, white to yellow; tube c. 3 mm long, c. 2 mm diam.; lobes linear to lanceolate, 5–6 mm long, 1–1.5 mm wide, with sparse trichomes internally. Corolline corona comprising 5 ridges, not terminating in apical lobes. Staminal corona comprising 5 oblong lobes shorter than staminal column, entire, adnate at base; lobes c. 0.5 mm long, c. 0.25 mm wide. Anther appendages triangular. Style-head conical-elongate. Pollinia oblong, 0.2–0.23 mm long. Follicles fusiform-ovoid, 3–4.5 cm long.

Grows on granite outcrops or in granite-derived soils in shrubland.