California Native Plant Society (CNPS) Rare Plant Ranking System
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.
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