When fully developed, the top half of the seed is readily detached, and the corky texture allows the encased seed to float and be carried to distant beaches by the ocean current.
The parent's other basal half is securely linked.
By the end of the growing season, the shifting sand buries its seed with that of the deceased parent.
Example:
The bipartite fruit of a sea rocket is a common annual beach plant found along the temperate zone's coastlines.