California Native Plant Society (CNPS) Rare Plant Ranking System

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CNPS Rare Plant Rank 4.2 Catalina mariposa lily. Image from CNPS: [1]

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


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.




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.