Since its inception in 1968, the CNPS Rare Plant Program has been a trusted resource for scientific accuracy and integrity. CNPS rare plant data are widely accepted as the standard for information on the rarity and endangerment status of the California flora. Today, we’re using these data to fight extinction, engage citizen scientists, and inform land use decisions statewide. Support CNPS plant science today!
First published in 1974, the Inventory is a widely-accepted authoritative resource on California’s rare and endangered plants. Now in its 8th edition online, it continues to play an important role in scientific research, conservation planning, and the effective enforcement of environmental laws. Learn more about the Inventory or access it now.
Get details on the CNPS ranking categories and how plants are assigned each rank.
These species are critical to the preservation of regional genetic diversity. Here’s what you should know.
Professionals and citizen scientists working to monitor and track our most vulnerable species.
