Banksia Oblongifolia - Taxonomy

Taxonomy

First collected by Luis Née between March and April 1793, the fern-leaved banksia was described by Antonio José Cavanilles in 1800 as two separate species from two collections, first as Banksia oblongifolia from the vicinity of Port Jackson (Sydney), and then as Banksia salicifolia from around Botany Bay. Derived from the Latin words oblongus "oblong", and folium "leaf", the species name refers to the shape of the leaves. Richard Anthony Salisbury had published the name Banksia aspleniifolia in 1796 based on leaves of cultivated material.

Robert Brown recorded 31 species of Banksia in his 1810 work Prodromus Florae Novae Hollandiae et Insulae Van Diemen, and used the epithet oblongifolia in his taxonomic arrangement, placing the taxon in the subgenus Banksia verae, the "True Banksias", because the inflorescence is a typical Banksia flower spike. He recognised B. salicifolia as the same species at this point, but was unsure whether Salisbury's B. aspleniifolia belonged under the same name. By the time Carl Meissner published his 1856 arrangement of the genus, there were 58 described Banksia species. Meissner divided Brown's Banksia verae, which had been renamed Eubanksia by Stephan Endlicher in 1847, into four series based on leaf properties. He followed Brown in using the name B. oblongifolia, and placed it in the series Salicinae.

In 1870, George Bentham published a thorough revision of Banksia in his landmark publication Flora Australiensis. In Bentham's arrangement, the number of recognised Banksia species was reduced from 60 to 46. He declared B. oblongifolia referrable to, and a synonym of, B. integrifolia. Bentham defined four sections based on leaf, style and pollen-presenter characters. B. integrifolia was placed in section Eubanksia.

Botanists in the 20th century recognised B. oblongifolia as a species in its own right, but disagreed on the name. Those in Queensland felt Salisbury's name was invalid and used Banksia oblongifolia, while New South Wales authorities used Banksia aspleniifolia as it was the oldest published name for the species. Botanist and banksia authority Alex George ruled that oblongifolia was the correct name in his 1981 revision of the genus. After reviewing Salisbury's original species description, which is of the leaves alone, he concluded that it does not diagnose the species to the exclusion of others and is hence not a validly published name—the description could have applied to juvenile leaves of B. paludosa, B. integrifolia or even B. marginata.