Weed
southern threecornerjack, three-cornered jack
AcheneAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat.
OvalOval:
Broadly elliptic.
with spines
Dark brown
Rough with irregular cavities
Three sharp spines at apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
The unit is an acheneAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat. with persistent floral parts. Floral parts are hard and woody with irregular cavities and three spines projecting from the apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.. E. australis is larger than E. spinosa.
See USDA-ARS Technical Bulletin 1719: Identification of DisseminulesDisseminule:
Detachable plant part capable of being disseminated and of propagating, commonly a seed or fruit.
Listed in the Federal Noxious Weed Act.
State Noxious Weed: Hawaii
Federal
Learn more on ITP's Federal Noxious Weed Disseminules tool, listed under Emex australis.
Not included
Polygonaceae
Emex australis Steinh.
Rumex hypogaeus T. M. Schust. & RevealL
