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Starr 070320-5786 Emex spinosa.jpg
Emex spinosa
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Core eudicots
Order: Caryophyllales
Family: Polygonaceae
Genus: Emex

Emex is a genus of annual herbaceous plants of the Polygonaceae family. There are only two species in this genus: Emex australis, commonly known as doublegee or three-cornered jack, which is a weed in Australia, and Emex spinosa or lesser jack.

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