Emex
Emex est genus annuarum herbacearum plantarum florentium familiae Polygonacearum. Sunt in genere duae species: Emex australis (Anglice doublegee, three-cornered jack), herba inutilis in Australia, et Emex spinosa (Anglice lesser jack).

Nexus externi 

"Jepson Manual Treatment,"

Genera plantarum 
Polygonoideae
Taxa Campderá