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Guaiacum officinale, lignum vitae. Small ornamental tree or shrub from Central America. The hard wood, denser than water, is used for mallets and bowling balls, and yields a resin that is used in medicine, stain, and a chemical indicator. | ||||
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Tribulus terrestris, puncture vine. Noxious, often roadside vine from the Mediterranean region. The fruits are woody, and when mature, will easily penetrate bicycle tires. | ||||
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Tribulus cistoides, nohu. Hawaiian indigenous species. |
