Nearly 600 species of plants, from 93 families, have been identified within the Santa Lucia Preserve. This includes over 13 species of plants considered at-risk by the California Natural Diversity database, such as Hooked popcorn flower, Pinnacles buckwheat, and Pacific Grove clover.
Using a recently updated and standardized system for classifying vegetation types in California (Sawyer, J.O. et al. 2009), the Preserve contains 54 vegetation types (or “Alliances”). Twenty-five of these are considered at-risk by the California Natural Diversity Database including Monterey pine forest, Redwood forest, and Brittle-leaf - Woolly-leaf manzanita chaparral.