East Bay Native Plant Species Alameda and Contra Costa counties are home to many native plant species. We have assembled an incomplete (but growing!) collection of photographs and information about many of these. Search for: Show all species Clay mariposa lily (Calochortus argillosus), Lime Ridge Open Space, Walnut Creek. Photo by Cathy Chambers.California horkelia (Horkelia californica). Photo by Toni Corelli (CC-BY-NC 4.0).Pallid manzanita (Arctostaphylos pallida) and brittleleaf manzanita (A. crustacea) grow in the rocky soil of a manzanita barren at Huckleberry Preserve.Warrior's plume (Pedicularis densiflora). Photo by Helen Hancock.