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!
Areas of Focus
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.
The coast yellow leptosiphon and the Lassics lupine now have state endangered species protection, thanks in large part to two CNPS members who stepped forward to champion these sensitive species.
CNPS auctions off a rare chance to name a newly described California native plant. This is the first time naming rights have been auctioned for a plant in California.
CNPS has settled a long-running dispute over the Newhall Ranch development project in northwestern Los Angeles County. The agreement with the owner secures major CNPS interests.