CNPS Rare Plant Inventory 50th anniversary

The California Native Plant Society

Rare Plant Inventory

Celebrating five decades of rare plant conservation and the people that make it possible.

Thank you to the countless volunteers and individuals who make the CNPS Rare Plant Inventory Possible!

From government agencies to college classrooms, California relies on the CNPS Rare Plant Inventory for the science-backed information we need today, to protect rare and endangered plants for tomorrow.

Since 1974, CNPS and a trusted network of partners have reviewed more than 3,500 species, creating the gold standard for rare plant review and actionable data. Today, more than 35% of California flora receives some form of protection thanks to the Rare Plant Inventory.

Be part of the tradition!

Support the work to document, review, and rank California’s rare plants and to update and maintain the online Rare Plant Inventory. You can help by donating in support of this important work or by volunteering your time by becoming a status reviewer. Select from one of the two options below to get started.



Support the CNPS Rare Plant Inventory

Image: David Magney

Get involved

Get involved

Sign up to review plants being
proposed for addition or change
in the Rare Plant Inventory

Image: Aaron Sims