Pliny, Naturalis Historia 21.54: Tribulo proprietas, quod et fructum spinosum habet. The caltrop has the distinctive property that it even has a spiny fruit. There are a few plants called tribulus ‘caltrop’, in both English and Latin.  The one that today has Tribulus as its scientific name, the puncturevine, is probably not the one being referred to, […]

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