Banksia ser. Tetragonae is a taxonomic series in the genus Banksia. It consists of three closely related species of erect shrub with pendulous inflorescences in section Banksia. These are:
Image Scientific name Distribution B. lemanniana (Lemann's banksia) Western Australia B. caleyi (Cayley's banksia) Western Australia, from South Stirling to the West River and northeast to Pingrup B. aculeata (prickly banksia) Stirling Range in the southwest of Western Australia
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