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Conospermum caeruleum , commonly known as blue brother , is a shrub in the family Proteaceae and is endemic to the south west of Western Australia .. Proteaceae. Proteaceae. Conospermum. Conospermum. family. Family ( biology ). Western Australia. Western Australia. It is a prostrate shrub with small , dense heads of blue , rarely pink flowers and usually grows in heavy soils subject to flooding .