i saw this (only this one!) along the ridgeline of the Santa Ana Mtns between Corona (where i hiked in from) and Orange County, CA ...this waa overhanging the trail a bit, growing on the afternoon sun side of the trail
I was surprised to see a solid mat of T. hirtum at the top of the nice retaining wall Caltrans built after taking over this large area for road construction. Too bad it wasn't relandscaped with native plants.