I have not yet seen these perennial wildflowers. They grow near oaks and can be hard to spot. Frank first noticed the stems and then went back to capture this magnificent photo.

Mission Bells, also called Checker Lily, are members of the Lily family. Their scientific name is Fritillaria affinis. Below is a closeup of the flower.

In Reny Parker's wildflower book she writes,
 "Mission Bells
  the sound in the forest
  no one's around to hear."

Thanks to Frank for allowing me to share his photos with you here.