 Nelson has suggested that there was once a continuous strip of siliceous sand along the coast, providing an extensive and unfragmented habitat for "B. epica"; rises in the sea level had submerged this strip, leaving only the cliff-top dunes as suitable habitat.The fact that the resultant isolated populations have not perceptibly speciated since then suggests that the species has been fragmented for only a short time, perhaps only since the Last Glacial Maximum.Pollinators of "B. epica" include "Phylidonyris novaehollandiae" (New Holland honeyeater) and "Acanthiza chrysorrhoa" (yellow-rumped thornbill).