 As the spikes age, their flowers fall off and they develop up to 50 follicles, each of which contains two seeds.Alex George described the plant in his 1981 monograph of the genus "Banksia" as a variety of "Banksia integrifolia", but later reclassified it as a separate species.Genetic studies show it to be related to "Banksia plagiocarpa", "Banksia oblongifolia" and "Banksia robur".