A smooth white moth with a wing span of 40 mm, with, as the name suggests two small spots of black on the wings. Surprisingly, the underside showed orange and black banding on the dorsal side of the abdomen and a white belly. The legs were covered with short orange coloured setae. Eyes and antennae were black. labial palps were rec-curved.
Matches all points of description in Flora of Victoria (online), except that sepals are 7mm long versus max 4mm in description. (Fine hairs on sepals are too small to see in photo, but were examined under microscope.) Have not examined taproot or seed. Measured several stems to 1.8m but they may be longer as I could not get to the base of the plant.