Mount Diablo Globe Lily, Mount Diablo Fairy Lantern

This wildflower occurs only on Mount Diablo and in surrounding hills of the East Bay. Look for this flower in wooded or brushy hillsides with northern exposure; frequently in canyons; 700 feet to the summit.  

This plant is rare, per Cal Flora:  California Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).