Distribution and Habitat
A relatively common species, the holly-leaved banksia is widely distributed within south west Western Australia. It occurs within 70 km (45 mi) of the coast, from Mount Lesueur to Augusta, and then east to the Cordinup River east of Albany. In the Margaret River region, it grows on yellow sand plains behind the Leeuwin-Naturaliste Ridge. Almost all occurrences are to the west (seaward) side of the Darling Scarp, although there are two outlying populations - one near Collie east of Bunbury and the other in the Tonbridge-Lake Muir area near Manjimup. Along the south coast, there is one inland population at Sheepwash Nature Reserve near Narrikup northwest of Albany. The annual rainfall over its distribution ranges from 600 to 1100 mm (25–45 in).
Banksia ilicifolia grows exclusively on sandy soils; its range ends where heavy soils are evident. It especially favours low-lying areas. It generally grows in open woodland alongside such trees as jarrah (Eucalyptus marginata), candlestick banksia (Banksia attenuata), firewood banksia (B. menziesii) and Western Australian Christmas tree (Nuytsia floribunda). Along the south coast, it grows in heath, sometimes forming stands with bull banksia (B. grandis).
The holly-leaved banksia gives it is name to the Banksia ilicifolia woodlands ('community type 22'), a possibly threatened ecological community found in the Bassendean and Spearwood systems in the central Swan Coastal Plain north of Rockingham. These are low-lying areas which are seasonally waterlogged. The habitat is open woodland and with an open understorey, and such trees as B. ilicifolia, B. attenuata and stout paperbark (Melaleuca preissiana).
Banksia ilicifolia is a component of the critically endangered Assemblage of Tumulus Springs (organic mound springs) of the Swan Coastal Plain community north of Perth, which is characterised by a permanently moist peaty soil. The dominant trees include M. preissiana, swamp banksia (B. littoralis) and flooded gum (Eucalyptus rudis), with understorey ferns such as bracken (Pteridium esculentum) and Cyclosorus interruptus, and shrubs swamp peppermint (Taxandria linearifolia) and Astartea fascicularis.
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