Tetratheca decora, also known as black-eyed susan, is a species of plant in the quandong family that is endemic to Australia.
The species grows as a small, erect shrub to 30–40 cm in height. The deep lilac-pink flowers have petals 6–15 mm long, appearing mainly from September to November.[1]
The plants have a scattered distribution across central eastern New South Wales from the Warrumbungles to the Nowra area, occurring in heath and dry sclerophyll forest on sandstone substrates.[1]