Dudleya cymosa ssp. crebrifolia

Dudleya cymosa subsp. crebrifolia is a subspecies of succulent plant commonly known as the San Gabriel River dudleya. Endemic to Los Angeles County, California, this very distinct subspecies is only known from the granitic slopes of a few canyons at the foot of the San Gabriel Mountains near Azusa. It is characterized by the tightly spaced bracts along its inflorescence and its mustard-yellow flowers that bloom from late June to July. It grows with another rare endemic, Dudleya densiflora....read more on Wikipedia.