Rumex hypogaeus

Rumex hypogaeus (synonym Emex australis), commonly known in English as southern threecornerjack, devil's thorn, or double gee (also doublegee, from the old Afrikaner name dubbeltge-doorn - 'double thorned'), is a herbaceous plant of the Polygonaceae. It is native in South Africa and is an invasive species in Australia, Texas in the USA & Pakistan.

Rumex hypogaeus
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Polygonaceae
Genus: Rumex
Species:
R. hypogaeus
Binomial name
Rumex hypogaeus
Synonyms

Emex australis Steinh.
Vibo australis (Steinh.) Greene

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