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Polygonaceae family

Southern Threecornerjack Emex australis

Southern Threecornerjack is an introduced annual herb, found in the lower 48 states.

More about this plant

Rumex hypogaeus, commonly known in English as southern threecornerjack, devil's thorn, or double gee, is a herbaceous plant of the Polygonaceae. It is native in South Africa and is an invasive species in Australia, Texas in the USA, and Pakistan. Wikipedia →

⚠ Invasive here — plant a native instead USDA + GBIF

Southern Threecornerjack is flagged invasive in the U.S. These natives fill a similar niche — same growth habit, bloom season, height, and region — so you keep the look and feed local wildlife instead of spreading a problem.

Butterfly Weed
Native ★
Butterfly Weed
Asclepias tuberosa
●●●●●
New England Aster
Native ★
New England Aster
Symphyotrichum novae-angliae
●●●●●
Black-eyed Susan
Native
Black-eyed Susan
Rudbeckia hirta
●●●●●
Spider Milkweed
Native ★
Spider Milkweed
Asclepias asperula
●●●●●
Matched on growth habit · bloom months · mature height · shared U.S. range (USDA + GBIF) — a starting point, not a prescription.

Growing & care

USDA PLANTS · TRY
Conditions
Sources · Conditions
Cold hardiness (derived) — Hardiness
Hardiness
≥ zone 11 derived from its U.S. range
Size & form
Sources · Size & form
USDA PLANTS — Lifespan
Lifespan
Annual
In the garden
Herb layer — Sits in the herb of a layered food forest or polyculture.Open guide →
derived roles
Species characteristics from USDA PLANTS (public domain) + TRY (CC BY) — general guidance, not a guarantee for your exact site. Deer "browsing" is documented palatability, not a deer-proof claim.
Sources for this entry (9) Open & cited
[01] Scientific name & family — USDA PLANTS (DwCA, Zenodo 17903503)
[02] Growth habit & duration — USDA PLANTS (DwCA, Zenodo 17903503)
[03] Native status & distribution — USDA PLANTS (DwCA, Zenodo 17903503)
[04] Common name — USDA PLANTS (via GBIF)
[05] Invasive / introduced status — US-RIIS v2.0 (USGS)
[07] Description — Wikipedia (CC BY-SA)
[08] Ecological value — GloBI
[09] Cold hardiness (derived) — Derived from U.S. range × USDA PHZM zones
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