Pterygodium hallii young flower

The partly opened flower of Pterygodium hallii in picture is almost entirely green to yellowish in varying pale shades, apart from some dark purple spots already visible on the developing lip.

The broad median sepal below with curved-up tip is close to the two large, shallowly concave lateral petals, positioned inside the lateral sepals that are paler than them. Below the obovately shaped lip that will be densely purple-spotted when fully presented, the central lip appendage will become greenish with a purple-black patch at its base as well. This lip appendage is mitre-shaped with two keels at its base, not bilobed as in P. inversum.

Flowering happens from late winter to mid-spring, irrespective of whether winter fires occurred or not (Liltved and Johnson, 2012; Le Roux, et al, 2005).