Polygonaceae

Southern threecornerjack

Emex australis Steinh.

Family: Polygonaceae
Genus: Emex

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Southern threecornerjack: KRT4270 — Photo: Kevin Thiele from Perth, Australia, CC BY 2.0, from Wikimedia Commons

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Common names

By language (4)

Arabic: حمباز جنوبي
arz: حمباز جنوبى
Chinese: 南方三棘果, 南方尖刺酸模
English: Southern threecornerjack

Synonyms

Emex centropodium Meisn.

Flowers

In flower: June to November (from 27 flowering iNaturalist observations worldwide)

Characteristics

Growth habit: Forb/herb
Lifespan: Annual
In the US and Canada: Lower 48 states: introduced

Photos

Photo: Kevin Thiele from Perth, Australia, CC BY 2.0, from Wikimedia Commons

More in Emex

Spiny threecornerjackEmex spinosaPolygonaceae

Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); common names, US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.