Oso manzanita

Arctostaphylos osoensis, described by P.V. Wells in 1992, is a rare species of manzanita found only in San Luis Obispo County, California. It occurs in two known locations on the northern edge of the Los Osos Valley. The plant is restricted to a specific geological substrate: volcanic dacite from the Morro Rock-Islay Hill Complex, which is part of the broader Nine Sisters geological area. This limited distribution highlights the species' ecological specificity and conservation significance.