Weed
spiny threecornerjack, devil's thorn
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
Hard, woody with irregular cavities
Three spines at the 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. They often appear in clusters. E. spinosa is smaller than E. australis.
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 spinosus.
Not included
Polygonaceae
Emex spinosa (L.) Campd.
Rumex spinosus L.
