Banksia Prionotes - Taxonomy

Taxonomy

Banksia prionotes was first published by English botanist John Lindley in the January 1840 issue of his A Sketch of the Vegetation of the Swan River Colony; hence the species' standard author citation is Banksia prionotes Lindl. He did not specify the type material upon which he based the species, but A Sketch of the Vegetation of the Swan River Colony is based primarily upon the collections of early settler and botanist James Drummond. A sheet of mounted specimens at the University of Cambridge Herbarium (CGE), labelled "Swan River, Drummond, 1839" and annotated "Banksia prionotes m" in Lindley's hand, has since been designated the lectotype. Lindley also made no mention of the etymology of the specific epithet, "prionotes", but it is assumed to be derived from the Ancient Greek prion ("saw") and -otes ("quality"), referring to the serrated leaf margins.

The most commonly reported common names of B. prionotes are Acorn Banksia, derived from the resemblance of partly opened inflorescences to acorns; and Orange Banksia. Other reported common names include Saw-toothed Banksia and Golden Banksia Bwongka is a generic Noongar name for Banksia in the Avon River catchment, where B. prionotes is one of several species occurring.

No further subspecies or varieties of B. prionotes have been described, and it has no taxonomic synonyms. Its only nomenclatural synonym is Sirmuellera prionotes, which arose from Otto Kuntze's unsuccessful 1891 attempt to transfer Banksia into the new name Sirmuellera. When Carl Meissner published his infrageneric arrangement of Banksia in 1856, he placed B. prionotes in section Eubanksia because its inflorescence is a spike rather than a domed head, and in series Salicinae, a large series that is now considered quite heterogeneous. This series was discarded in the 1870 arrangement of George Bentham; instead, B. prionotes was placed in section Orthostylis, which Bentham defined as consisting of those Banksia species with flat leaves with serrated margins, and rigid, erect styles that "give the cones after the flowers have opened a different aspect". In 1981, Alex George published a revised arrangement that placed B. prionotes in the subgenus Banksia because of its flower spike, section Banksia because its styles are straight rather than hooked, and the series Crocinae, a new series of four closely related species, all with bright orange perianths and pistils.

George's arrangement remained current until 1996, when Kevin Thiele and Pauline Ladiges published an arrangement informed by a cladistic analysis of morphological characteristics. Their arrangement maintained B. prionotes in B. subg. Banksia, but discarded George's sections and his series Crocinae. Instead, B. prionotes was placed at the end of series Banksia, in subseries Cratistylis. Questioning the emphasis on cladistics in Thiele and Ladiges' arrangement, George published a slightly modified version of his 1981 arrangement in his 1999 treatment of Banksia for the Flora of Australia series of monographs. To date, this remains the most recent comprehensive arrangement. The placement of B. prionotes in George's 1999 arrangement may be summarised as follows:

Banksia

B. subg. Banksia

B. sect. Banksia

B. ser. Salicinae (11 species, 7 subspecies)

B. ser. Grandes (2 species)

B. ser. Banksia (8 species)

B. ser. Crocinae

B. prionotes

B. burdettii

B. hookeriana

B. victoriae

B. ser. Prostratae (6 species, 3 varieties)

B. ser. Cyrtostylis (13 species)

B. ser. Tetragonae (3 species)

B. ser. Bauerinae (1 species)

B. ser. Quercinae (2 species)

B. sect. Coccinea (1 species)

B. sect. Oncostylis (4 series, 22 species, 4 subspecies, 11 varieties)

B. subg. Isostylis (3 species)

Since 1998, American botanist Austin Mast has been publishing results of ongoing cladistic analyses of DNA sequence data for the subtribe Banksiinae, which includes Banksia. With respect to B. prionotes, Mast's results are fairly consistent with those of both George and Thiele and Ladiges. Series Crocinae appears to be monophyletic, and B. hookeriana is confirmed as B. prionotes' closest relative. Overall, however, the inferred phylogeny is very different from George's arrangement. Early in 2007, Mast and Thiele initiated a rearrangement of Banksiinae by publishing several new names, including subgenus Spathulatae for the species of Banksia that have spoon-shaped cotyledons; in this way they also redefined the autonym B. subgenus Banksia. They have not yet published a full arrangement, but if their nomenclatural changes are taken as an interim arrangement, then B. prionotes is placed in subgenus Banksia.