CNPS Inventory of Rare and Endangered Plants of California

The CNPS Inventory of Rare and Endangered Plants of California is a botanical online database providing information on rare, threatened, and endangered California native plants.

[2] In 2014 the CNPS Rare Plant Program began including Lichens of Conservation Concern.

[2] The Inventory is published every three to five years and is used by the State and Federal government for conservation planning.

[2][4] It is used for scientific research, conservation and preservation, and enforcement of environmental laws in California.

[2] [5] CNPS originally developed the Inventory of Rare and Endangered Plants of California with the guidance of botanist and evolutionary biologist G. Ledyard Stebbins.