Operculina hamiltonii

Flowers axillary, solitary, rarely in few flowered cymes; peduncles striate to angulate, sometimes winged distally, glabrous, greatly exceeding the subtending petiole, 33–80 mm long; bracts two, lanceolate to ovate, base rounded, blade membranous, apex acute to attenuate, fugacious, when present in the dried state reddish brown, 7–16 mm long and 3–6.5 mm wide, glabrous; pedicels clavate, winged or angulate, glabrous, 15–25 mm long, thickening in Fruit, becoming strongly five angled; sepals equal, broadly ovate to suborbicular, basally obtuse to acute, margins thin and membranous, entire, apices rounded, obtuse or acute, mucronate, glabrous, reddish–brown in dry state, enlarging and becoming woody in Fruit, 23–30 mm long and 16–21 mm wide; corolla campanulate toothed, bright yellow, hirsute apically or all along the backs of the interplicae, otherwise glabrous, 35–52 mm long and 33–51 mm wide; stamens included, filaments adnate for 2/3 to 3/4 of their length, bearded on the attached portion, glabrous where free, anthers spirally dehiscent at maturity, yellow, 6–7 mm long; Pollen 3-colpate, smooth; style simple, filiform, to 20 mm long, stigma biglobose.