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WordReference Random House Unabridged Dictionary of American English © 2024grass′ tree′, - Plant Biologyany Australian plant of the genus Xanthorrhoea, of the lily family, having a stout, woody stem bearing a tuft of long grasslike leaves and a dense flower spike.
Collins Concise English Dictionary © HarperCollins Publishers:: grass tree n - Also called: black boy, yacca, yacka any plant of the Australian genus Xanthorrhoea, having a woody stem, stiff grasslike leaves, and a spike of small white flowers: family Xanthorrhoeaceae. Some species produce fragrant resins
- any of several similar Australasian plants
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