Operculina brownii Ooststr.

A glabrous twiner. Stems angular to narrowly alate. Leaves narrowly ovate-oblong or ovate, 5½-8½ by 2-4½ cm, long-attenuate to the acute or obtusish, mucronulate apex; midrib and 7-8 nerves on either side prominent beneath; petiole much shorter than the blade, ca 1-2 cm. Peduncles stout, angular or narrowly winged, 2-3½ cm. Pedicels angular, clavate above, 1½-2½ cm, much thickened in fruit. Sepals broadly elliptic to orbicular, broadly rounded at the apex, 22-25 mm long; inner ones only slightly shorter than outer ones, all glabrous and all much enlarged in fruity up to 30 mm long. Corolla funnel-shaped, to 5 cm long (only one examined), white, glabrous. Capsule 3½-4 cm diam., enclosed by the large cup-shaped calyx. Seeds ca 15 mm long, glabrous, dull black.

It is a tropical and subtropical plant. It can grow on poor soils and rocky sandstone.