The flowers of Pterygodium ingeanum grow in somewhat dense spikes that are up to 8 cm long, carrying up to 33 flowers.
The flowers are greenish yellow with dark red margins that become almost black. The lateral petals fringe the wide flower mouth, cohering with the dorsal sepal that is notched at its tip; these three form the hood over the flower. The lateral sepals are sac-like, partly fused.
The lip below, only 3 mm long and with a narrow stalk-like base, has two spreading lobes at its tip, sometimes a small central one as well. The lip appendage, typical of Pterygodium flowers, is 6 mm long, shield-like and erect. It has two lobes that taper to acute points and arch backwards into the flower, over the anther. The twisted ovary is about 1 cm long, hidden by the bracts. The flowers exude a mild fragrance.
Flowering happens in the first half of spring. Flowering is not fire-dependent (Liltved and Johnson, 2012; iSpot).