Flowers are 4 5 cm in diameter; calyx with 6 ovate, green lobes, 5 10 ?5 9 mm; there are 6 petals, widely obovate, 15 25 ?15 19 mm, yellow or occasionally white, frequently purple at edges and apex; the staminal ring has 370 510 stamens, with filaments 1.5 2 mm long, wider at apex, yellow, with anthers 0.5 mm long; hood flat, 10 20 ?16 20 mm, yellow, sometimes white, with well-developed appendages, proximal with anthers, distal antherless, the pollen of hood turning black with age; hypanthium usually puberulous, sometimes glabrous; ovary 4-locular, with 12 26 ovules in each locule, the ovules inserted on lower part of septum, the style 1.5 2 mm long, with annular expansion towards the tip.
