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Photo numbers:
475-726: Plum Canyon. 
727-839: Cactus Loop Trail and Tamarisk Grove Campground. 
> 840: Cross country to Smugglers Canyon.

See also:
Suzanne Hart.  "Fans of Anza-Borrego Desert State Park fight two invasive plants threatening wildflowers."  The Press-Enterprise, April 5, 2017.  The article notes that about 100 invasive plant species have been found in the park and focuses specifically on Voluntaria tubuliflora and Sahara mustard.  The Anza-Borrego Foundation has organized volunteer weedings in the winter months to counter these plants and posted flyers on how to identify and stop the spread of them.