All known populations were completely killed off in late 1991 or early 1992.

There are at least 1000 individuals in the single known population.

Several of the known populations are found within national forests.

Each of the four known populations has between 100 and 1400 individuals.

They represent the only known population of the species in Massachusetts.

There is only a single known population composed of 26 plants.

The only known population of this species grows on a road bank.

The population in the park is one of only three known populations.

There are three known populations for a total number of plants between 200 and 300.

The area is home to a significant portion of the species' known population.