Like most brown algae, Postelsia goes through alternation of generations, and is an annual species.

The alternate leaves are often succulent, only a few annual species have thin and flat leaves.

It is an annual species found in sandy areas, near riverbeds, lakes, and fields.

The life cycles of most annual species range from two to ten years, although some could be longer.

An annual species, this plant may be much more prevalent in years with sufficient rainfall.

Most adults die within the spawning season or shortly after causing them to be deemed an annual species.

There are annual and perennial species which may be climbing or bushy.

The ten perennial and six annual species are restricted to western North America.

At dawn, it descends to the desert floor to feed upon the different annual species which are abundant following summer rains.

The fish might also be effectively an annual species with a lifespan of just a single year in nature.