Flora of New York/Protected species index

The following list is based on [https://govt.westlaw.com/nycrr/Document/I21efe775c22211ddb7c8fb397c5bd26b?viewType=FullText&originationContext=documenttoc&transitionType=CategoryPageItem&contextData=%28sc.Default%29 Regulations Ch. 2, Part 193.3, Protected Native Plants] from the New York State Department of Environmental Conservation.

Key to # column
1. Endangered native plants - In danger of extirpation throughout all or a significant portion of their ranges within the state and requiring remedial action to prevent such extinction.
 * Five or fewer extant sites, or
 * Fewer than 1,000 individuals, or
 * Restricted to fewer than four U.S.G.S. 7 1/2 minute series maps, or
 * Listed as endangered by the United States Department of Interior.

2. Threatened native plants - Likely to become endangered within the foreseeable future throughout all or a significant portion of their ranges within the state.
 * Six to fewer than 20 extant sites, or
 * 1,000 to fewer than 3,000 individuals, or
 * Restricted to not less than four or more than seven U.S.G.S. 7 1/2 minute series maps, or
 * Listed as threatened by the United States Department of Interior in the Code of Federal Regulations.

3. Rare native plants
 * 20 to 35 extant sites or
 * 3,000 to 5,000 individuals statewide.

4. Exploitably vulnerable native plants - Likely to become threatened in the near future throughout all or a significant portion of their ranges within the state if causal factors continue unchecked. Includes plants that are likely to be picked for commercial and personal purposes.