The status of a cultivar

So if you look on the page for any cultivar, you will see a status section. This is for how rare/common a cultivar is. Here are the rankings, created by me, for categorizing how rare a cultivar is:

Unknown: No info

Very common: Well known, and can be found in most vegetable gardens, seed catalogs, and even grocery stores and farmers market.

Common: Not in any threat of going extinct.

Uncommon: Not too common, but, not in danger of going extinct.

Vulnerable: Numbers are lowering, and could go extinct.

Rare: Numbers are low, and could go extinct.

Nearly extinct: Very few specimens in existance, could go extinct in a few years, and maybe only owned by certain groups, such as families or seed vaults

Functionally extinct: Not enough specimens to sustain a population, and soon to go extinct.

Extinct: None are left.