Erect, perennial herb, 0.3-0.6 m high. Leaves up to 12 x 12 mm, ovate, reflexed, coriaceous or fleshy, pale green. Flowers in 1-flowered cymes or corymbose. Calyx: segments 5, lanceolate, keeled or with narrow wing. Corolla yellow; tube 4.00-7.25 mm long; clawed. Stamens inserted in corolla sinuses; anthers with 2 sessile or stipitate basal glands. Style with or without very small swelling below middle; stigma capitate or clavate, bilobed. Fruit a capsule.
Perennial to 60 cm. Leaves ovate, reflexed. Flowers 5-lobed, yellow, calyx lobes keeled, stamens inserted in sinuses, anthers with 2 basal glands, style swelling absent or small.