Rumex hypogaeus T.M.Schust. & Reveal, Taxon 64: 1203 (2015) (syn: Emex australis Steinh. ; Emex centropodium Meisn. ; Rumex spinosus Thunb. ; Vibo australis (Steinh.) Greene ; Vibo centropodium Kuntze );
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S. Africa: Cape Provinces, Eswatini, Free State, KwaZulu-Natal, Lesotho, Namibia, Northern Provinces; Introduced into: California, Germany, Hawaii, India, Kenya, Madagascar, Malawi, Mauritius, Mozambique, New Caledonia, New South Wales, New Zealand North, New Zealand South, Northern Territory, Pakistan, Queensland, Réunion, South Australia, St.Helena, Taiwan, Tanzania, Tasmania, Trinidad-Tobago, Victoria, Western Australia, Yemen, Zimbabwe as per POWO;
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Rumex hypogaeus T.M.Schust. & Reveal: 9 very high res. images.
Habitat : No idea where it came from in my garden.
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References:
POWO Wikipedia Wikimedia Commons iNaturalist Plant Net Lucid Central