August 19, 2020 Castilleja exserta ssp. exserta Purple Owl’s Clover Purple owl's clover (Castilleja exserta ssp. exserta). Photo by Elsa de Becker.Lush spring display at the Skyline Serpentine Prairie: goldfields (Lasthenia californica), purple owl’s clover (Castilleja exserta), and new leaves of soaproot (Chlorogalum pomeridianum). Photo by Lech Naumovich. Where to see itWhere to Find Beautiful Native Plants Now: Mount Diablo State Park’s Serpentine SoilSkyline Serpentine Prairie Revisited
