Western Australia, Weeds of Western Australia, Caltrop, Tribulus terrestris l
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Spiked metal balls, known as "caltrops" were often used in medieval warfare, when & areas of ground in front of defended positions were sown with these spikes to hamper the operations of enemy cavalry by crippling the horses. Although the fruits of Tribulus terrestris are not quite as severe in their effects, they do resemble the old implements of warfare and have taken their name.
Meadly, G R. W
"Weeds of Western Australia—Caltrop,"
Journal of the Department of Agriculture, Western Australia, Series 3: Vol. 3:
6, Article 11.
Available at: https://library.dpird.wa.gov.au/journal_agriculture3/vol3/iss6/11