List of species endemic to Mendocino County, California

This is a list of plant and animal species, subspecies and varieties that are endemic to Mendocino County, California, or to Mendocino and no more than one neighboring county.

Mendocino County only[]

Chorizanthe howellii, a flowering plant in the buckwheat family found only near Fort Bragg
Cuscuta pacifica var. papillata, a parasitic plant found only in the salt marshes of Mendocino county
Eriogonum kelloggii, a species of buckwheat found only on Red Mountain near Leggett
Harmonia guggolziorum, a flowering aster found in two locations near Hopland
Limnanthes bakeri, a meadowfarm plant known in only 20 locations near Willits
Pinus contorta var. bolanderi, the Mendocino shore pine tree, a variety of the more widespread lodgepole pine
Sedum eastwoodiae, a flower in the stonecrop family found only on Red Mountain near Ukiah

Aplodontia rufa nigra (Point Arena mountain beaver), a mid-sized rodent regarded as a living fossil and found only near Point Arena
Opercularia ampluscolonia, a protist that inhabits ponds in Mendocino County
Plebejus idas lotis (Lotis blue butterfly), a possibly extinct gossamer-winged butterfly last recorded near Mendocino town in 1983^[1]
Speyeria zerene behrensii (Behrens' silverspot butterfly), found only near Point Arena

In addition, the following are endemic to an area contained in Mendocino and only one neighboring county:

Arctostaphylos mendocinoensis, a species of manzanita found only in Mendocino and Sonoma counties
Astragalus agnicidus, a species of milkvetch found only in Mendocino and Humboldt counties
Cupressus pigmaea, a species of cypress tree found only in Mendocino and Sonoma counties
Lewisia stebbinsii, a flowering purslane found only in Mendocino and Trinity counties
Veratrum fimbriatum, the fringed corn lily, a relative of the lily found only in Mendocino and Sonoma counties

Helminthoglypta arrosa pomoensis, the Pomo Bronze Shoulderband, a 39 mm (1.5 in) land snail found in redwood forests in Mendocino County (in the Big River, Navarro River, and Russian Gulch watersheds) and Sonoma County

^ "Blues: lotis blue (Lycaeides idas lotis)". The Xerces Society. Archived from the original on 2014-06-05. Retrieved 2014-06-10.