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English: Xanthorrhoea is a genus of 29 species of en:monocot, placed alone in the plant family Xanthorrhoeaceae, in order Asparagales. Commonly known as grasstrees or blackboys, they are native to Australia. They are recognisable by their tall flower-spike arising from a distinctive head of very long leaves. Some species grow a pseudo-trunk, which is actually a hollow ring of accumulated leaf-bases.
Flower spike, flowering
Flower spike, after fruiting
Cross-section of pseudo-trunk