12 rare plants

Global Conservation Ranks
The Nature Conservancy, NatureServe, and all state Natural Heritage programs use the following system for ranking the range-wide conservation status of vegetation types at the association level. Intermediate ranks (e.g., G3G4) may also be used. A question mark added to a rank expresses an uncertainty about the rank in the range of one either way on the 1-5 scale. For example a G2? rank indicates that the rank is thought to be a G2, but could be a G1 or a G3. A “Q” added to a rank denotes questionable taxonomy. It modifies the degree of imperilment and is only used in cases where the type would have a less imperiled rank if it were not recognized as a valid type (i.e., if it were combined with a more common type).
• G1 – critically imperiled throughout range.
• G2 – imperiled throughout range.
• G3 – rare or uncommon.
• G4 – widespread, abundant, and apparently secure, but with cause for long-term concern.
• G5 – demonstrably widespread, abundant, and secure.
• GNR – unranked; conservation status has not yet been assessed.
• GNA – not applicable because the community is not a suitable conservation target; usually assigned to ruderal, modified / disturbed, or managed vegetation.
State Conservation Ranks
VANHP ecologists employ a similar system for ranking the state-wide status of community types. Intermediate ranks (e.g., S3S4) may also be used.
• S1 – extremely rare, generally with = five occurrences state-wide, and/or covering < 50 ha (125 ac) in aggregate; or covering a larger aggregate area but highly threatened with destruction or modification.
• S2 – very rare, generally with six to 20 occurrences state-wide, and/or covering < 250 ha (600 ac) in aggregate; or covering a larger aggregate area but threatened with destruction or modification.
• S3 – rare to uncommon, generally with 21 to 100 occurrences state-wide; or with a larger number of occurrences subject to relatively high levels of threat; may be of relatively frequent occurrence in specific localities or geographic parts of the state.
• S4 – common, at least in certain regions of the state, and apparently secure, but with cause for long-term concern.
• S5 – very common and demonstrably secure.
• SNR – unranked; conservation status has not yet been assessed.
• SNA – not applicable because the community is not a suitable conservation target; usually assigned to ruderal, modified / disturbed, or managed vegetation.