California Native Plant Society (CNPS) Rare Plant Ranking System
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This page discuses the rarity index developed by the California Native Plant Society (CNPS).
Contents
Summary
The CNPS created the California Rare Plant Ranking System (RPRS) to define and categorize the rarity of Californian plant species.
For more information visit the CNPS RPRS description page and section on the RPRS in the CNPS Glossary of Terms and Field Descriptions.
Rankings
Plants are assigned a California Rare Plant Rank (CRPR) of 1A to 4 in addition to a threat rank .1 to .3 (e.g. 1B.2).
| California Rare Plant Ranks [2] | |
|---|---|
| 1A | Presumed Extirpated in CA, Rare or Extinct Elsewhere |
| 1B | Rare, Threatened, or Endangered in CA and Elsewhere |
| 2A | Presumed Extirpated in CA, Common Elsewhere |
| 2B | Rare, Threatened, or Endangered in CA, More Common Elsewhere |
| 3 | More Information is Needed (Review List) |
| 4 | Limited Distribution (Watch List) |
| Threat Rank [2] | |
|---|---|
| .1 | Seriously threatened: over 80% of occurrences threatened (high degree and immediacy of threat) |
| .2 | Moderately threatened: 20-80% occurrences threatened (moderate degree and immediacy of threat) |
| .3 | Not very threatened: less than 20% of occurrences threatened (low degree and immediacy of threat or no current threats known) |
References
- ↑ Santa Catalina mariposa lily photograph www.cnps.org/cnps/education/workshops/2016/0314_rare_plant.php
- ↑ 2.0 2.1 CNPS Glossary of Terms and Field Descriptions http://www.rareplants.cnps.org/glossary.html#lists
Links
Disclaimer
This page may contain student work completed as part of assigned coursework. It may not be accurate. It does not necessary reflect the opinion or policy of [CSUMB], its staff, or students.
