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Please upload this to iNaturalist so that the curator of botany at the San Diego Natural History Museum can find out if this is a county record. Great find!
If you post these photos on iNaturalist.org, you may be able to get an identification from Jon Rebman, who is an expert in the genus Cylindropuntia.
Nonnative, naturalizes, can hybridize with native Opuntia
Planted
Fruit long, flowers terminal. Cytisus scoparius is not extant here.