Difference between revisions of "California Native Plant Society (CNPS) Rare Plant Ranking System"

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[[Image:CNPS Rare Flower.jpg|230px|thumb|right|CRPR 4.2 Santa Catalina mariposa lily. Image from CNPS <ref name="CNPSpic">Santa Catalina mariposa lily photograph  http://www.cnps.org/cnps/education/workshops/2016/0314_rare_plant.php </ref>
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[[Image:CNPS Rare Flower.jpg|230px|thumb|right|CRPR 4.2 Santa Catalina mariposa lily. Image from CNPS. <ref name="CNPSpic">Santa Catalina mariposa lily photograph  http://www.cnps.org/cnps/education/workshops/2016/0314_rare_plant.php </ref>
 
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This page discuses the rarity index developed by the [[California Native Plant Society (CNPS)]].
 
This page discuses the rarity index developed by the [[California Native Plant Society (CNPS)]].
 
==Summary==
 
==Summary==
The [[CNPS]] created the California Rare Plant Ranking System (RPRS) to define and categorize the rarity of Californian plant species.  
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The California Rare Plant Ranking System (RPRS) was created by the [[CNPS]] in 1968 to evaluate and assign the rarity and endangerment status of California flora.<ref name="CNPSwebsite">CNPS Rare Plants website page https://www.cnps.org/rare-plants </ref> Threat ranks do not affect the amount of protection a plant receives, e.g. a CRPR 1B.3 plant has the same environmental protections as a CRPR 1B.1 plant.<ref name="CNPSwebsite"/>
  
For more information visit the [http://www.cnps.org/cnps/rareplants/ranking.php CNPS RPRS description page] and [http://www.rareplants.cnps.org/glossary.html#lists section on the RPRS in the CNPS Glossary of Terms and Field Descriptions].
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==Rare Plant Rank Determination==
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Scientists and volunteers work closely with the [[California Department of Fish and Wildlife]]'s [[California Natural Diversity Database]] (CNDDB) to collect data. Threat Ranks typically do not get regularly updated after the initial ranking is designated, so the rank might not always represent the current level of threats associated with a given taxon. Whenever a major change such as adding, deleting, or changing a California Rare Plant Rank is considered, it must be reviewed by the [[CNPS]], [[CNDDB]], regional Plant Status Review Groups, members of the Rare Plant Status Review Forum, and other experts.<ref name="CNPSwebsite"/>
  
 
==Rankings==
 
==Rankings==
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!scope="col" style="width: 100px;" |  California Rare Plant Ranks <ref name="CNPS">CNPS Glossary of Terms and Field Descriptions http://www.rareplants.cnps.org/glossary.html#lists </ref>
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!scope="col" style="width: 100px;" |  California Rare Plant Ranks <ref name="CNPSterms">CNPS Glossary of Terms and Field Descriptions http://www.rareplants.cnps.org/glossary.html#lists </ref>  
 
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* [[California Native Plant Society (CNPS)]]
 
* [[California Native Plant Society (CNPS)]]
* [[Solar Farms in the California Central Coast Region]]
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* [[California Natural Diversity Database]]
  
 
== Disclaimer ==
 
== 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 [[http://csumb.edu/ CSUMB]], its staff, or students.
 
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 [[http://csumb.edu/ CSUMB]], its staff, or students.

Revision as of 13:15, 25 March 2020

CRPR 4.2 Santa Catalina mariposa lily. Image from CNPS. [1]

This page discuses the rarity index developed by the California Native Plant Society (CNPS).

Summary

The California Rare Plant Ranking System (RPRS) was created by the CNPS in 1968 to evaluate and assign the rarity and endangerment status of California flora.[2] Threat ranks do not affect the amount of protection a plant receives, e.g. a CRPR 1B.3 plant has the same environmental protections as a CRPR 1B.1 plant.[2]

Rare Plant Rank Determination

Scientists and volunteers work closely with the California Department of Fish and Wildlife's California Natural Diversity Database (CNDDB) to collect data. Threat Ranks typically do not get regularly updated after the initial ranking is designated, so the rank might not always represent the current level of threats associated with a given taxon. Whenever a major change such as adding, deleting, or changing a California Rare Plant Rank is considered, it must be reviewed by the CNPS, CNDDB, regional Plant Status Review Groups, members of the Rare Plant Status Review Forum, and other experts.[2]

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 [3]
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 [3]
.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

  1. Santa Catalina mariposa lily photograph http://www.cnps.org/cnps/education/workshops/2016/0314_rare_plant.php
  2. 2.0 2.1 2.2 CNPS Rare Plants website page https://www.cnps.org/rare-plants
  3. 3.0 3.1 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.