There are only about two dozen natural populations in Arizona.
Both natural populations occur on private land, where they are difficult to protect.
However, diverse natural populations have been providing food and other products for much longer.
The species is abundant and there are no threats against natural populations.
In natural populations there are a number of forces acting.
The only inferences that have been made are those with the influence on natural populations.
They would be a natural population which is reproductively isolated from other such groups.
However, in natural populations the variance is often larger than this.
There are a total of about 2000 individuals in natural populations and 210 introduced plants.
Genetic variation and population structure study in natural populations 3.
