East Bay Native Plant Species Alameda and Contra Costa counties are home to many native plant species. We have assembled a growing collection of photographs and information about many of these. Search for: Show All Species Warrior's plume (Pedicularis densiflora). Photo by Helen Hancock.Big tarweed (Blepharizonia plumosa). Photo by Scott Yarger, CC BY-NC 4.0.Shell Ridge can be seen against the sky through the branches of this large, old valley oak. Photo by Bill Hunt.