NatureServe Conservation Status
Rounded Global Status Rank: T1 - Critically Imperiled
Reasons: Endemic to California, Dudleya cymosa ssp. crebrifolia occurs only in Los Angeles County and is known only from the type locality along Fish Canyon. It is 90% located on federal (USFS) lands and 10% extirpated on private lands which are mined for decomposed granite. The majority of the population occurs on cliff faces along Fish Canyon and the population extends for about 1 mile up the canyon. Threats to the plants on USFS land are relatively unthreatened with some possible low threats from recreation activites, erosion, etc. The population size is somewhat unknown since older field survey forms stated there were "thousands" of plants and the newest form states they saw 40 plants. The author of this account (Bittman, 2010) does not believe there are only 40 plants right now nor that there were many thousands in decades past. I am guessing, from having been there, that there may be as many as 3000 or something less than that. Binocular surveys would help in this case. Regular (every 5 years) monitoring would be very helpful to track trends of this narrow endemic.