three-cornered jack

== English == === Alternative forms === three corner jack, three cornered jack === Pronunciation === === Noun === three-cornered jack (plural three-cornered jacks) (Australia) A weed of species Emex australis. Synonym: devils thorns, doublegee 1901, South Australian Department of Agriculture, South Australian Department of Industry, Journal of Agriculture and Industry of South Australia, Volume 4, page 385, The “Three-cornered jack/Devils thorn” (Emex australis) is believed to be poisonous to them, as many dead locusts are found near to each plant. A seed vessel of this plant, which has three symmetrically arranged thorns and a pointed head. ==== Synonyms ==== (Emex australis): spiny emex (thorny seed of Emex australis): bindi, bindi-eye, bindii, cathead, cat's head, doublegee