On an immature thistle (possibly Cirsium brevistylum).
Yeah - San Bruno Elfin!! Had 45 min to kill waiting for Jess so I drove to SB mountain (10 min) wandered around for 25 min, and drove back - didn't know I'd stumble on one of the worlds most endangered butterflies!!
in front of house that is being renovated.
Hanging off a pine tree
Under test cover board.
Found on north facing slope in shallow soil.