Banksia ser. Salicinae is a valid botanic name for a series of Banksia. First published by Carl Meissner in 1856, the name has had three circumscriptions.
Systematics
According to Meissner
B. ser. Salicinae was first published in 1856, in Carl Meissner's chapter on the Proteaceae in A. P. de Candolle's Prodromus systematis naturalis regni vegetabilis. It was one of four series into which the subgenus Eubanksia was divided. These four series were defined in terms of leaf characters, with series Salicinae containing the species with linear, or nearly so, leaves with hoary grey undersides. As they were defined on leaf characters alone, all of Meissner's series were highly heterogeneous.
The placement and circumscription of B. ser. Salicinae in Meissner's arrangement may be summarised as follows: Banksia B. sect. Eubanksia B. ser. Abietinae (8 species, 1 variety) B. ser. Salicinae B. cunninghamii (now B. spinulosa var. cunninghamii) B. collina (now B. spinulosa var. collina) B. occidentalis B. littoralis B. cylindrostachya (now B. attenuata) B. lindleyana B. marginata B. marginata var. Cavanillesii (now B. marginata) B. marginata var. microstachya (now B. marginata) B. marginata var. humilis (now B. marginata) B. depressa (now B. marginata) B. depressa var. subintegra (now B. marginata) B. patula (now B. marginata) B. australis (now B. marginata) B. Gunnii (now B. marginata) B. insularis (now B. marginata) B. integrifolia B. integrifolia var. minor (now B. integrifolia subsp. integrifolia) B. integrifolia var. major (now B. integrifolia subsp. integrifolia) B. integrifolia var. dentata (now B. robur) B. compar (now B. integrifolia subsp. compar) B. paludosa B. verticillata B. media B. attenuata B. elatior (now B. aemula) B. lævigata B. Hookeriana B. prionotes B. Menziesii B. ser. Quercinae (18 species, 2 varieties) B. ser. Dryandroideae (8 species) B. sect. Isostylis (1 species)
Meissner's arrangement was current until 1870, when George Bentham published his arrangement, discarding all four of Meissner's series.
According to George
In 1981, Alex George published a thorough revision of Banksia in his classic monograph The genus Banksia L.f. (Proteaceae). He reinstated B. ser. Salicinae, placing it within B. sect. Banksia, and defining it as containing only those species with entire, serrate or dentate leaves; a small pollen-presenter; and unbeaked follicles.
The placement and circumscription of B. ser. Abietinae in George's taxonomic arrangement of Banksia may be summarised as follows: Banksia B. subg. Banksia B. sect. Banksia B. ser. Salicinae B. dentata B. aquilonia B. integrifolia B. integrifolia subsp. integrifolia B. integrifolia subsp. compar B. integrifolia subsp. monticola B. plagiocarpa B. oblongifolia B. robur B. conferta B. conferta subsp. conferta B. conferta subsp. penicillata B. paludosa B. paludosa subsp. astrolux B. paludosa subsp. paludosa B. marginata B. canei B. saxicola B. ser. Grandes (2 species) B. ser. Banksia (8 species) B. ser. Crocinae (4 species) B. ser. Prostratae (6 species, 3 varieties) B. ser. Cyrtostylis (13 species, 2 subspecies) B. ser. Tetragonae (3 species) B. ser. Bauerinae (1 species) B. ser. Quercinae B. quercifolia B. oreophila B. sect. Coccinea (1 species) B. sect. Oncostylis (3 series, 22 species, 4 subspecies, 11 varieties) B. subg. Isostylis (3 species)
In a later publication, George would refer to this series by the name B. ser. Banksiae, but this is probably a typographical error, as the name has not been validly published.
In 1991, the Tasmanian fossil taxon B. kingii was placed in this series.
According to Thiele and Ladiges
In 1996, Kevin Thiele and Pauline Ladiges undertook a cladistic analysis of morphological characters of Banksia, which yielded a phylogeny somewhat at odds with George's taxonomic arrangement. They found George's B. ser. Salicinae to be monophyletic, their cladogram placing it in a clade whose sister clade consisted of the members of George's B. ser. Quercinae and B. ser. Spicigerae: