Goldfields, Owls' Clover, and California Poppies in the serpentine grassland. The Lonely Valley Oak is leafing out in the spring. In recent years, the goldfields display has become more muted: perhaps invasive non-native (European) grasses are finding more of a foothold in the serpentine soil, due to nitrogen deposition from the catalytic converters in the cars on nearby Highway 280 (?). And/or perhaps the annual European grasses are evolving to colonize this soil. Road F, Jasper Ridge, 4/3/2008, 12:18 pm.