This photo clearly shows the long bractlets between the sepals, longer than the sepals themselves; this feature is unique to this species of Ivesia and is the source of its name, longibracteata. Photo by Julie Kierstead Nelson.
Ivesia longibracteata. Photo courtesy of Shasta-Trinity National Forest.
Castle Crags ivesia is known only from Castle Crags, both in the state park and adjacent national forest land in Castle Crags Wilderness Area, where it grows in crevices of granodiorite cliffs at about 4500 feet elevation. Photo by Br. Alfred Brousseau, Saint Mary's College.
Ivesia longibracteata range map.