California Prickbush or Spineshrub (Adolphia californica) is considered rare, threatened or endangered by the California Native Plant Society (CNPS), with a threat rank of 2B.1. This means it is seriously threatened in California – where most of it can be found here in San Diego County. It also grows in Baja California (Mexico), and CalFlora has two (obscure?) observations outside of San Diego County.
Pogogyne abramsii, the rare and threatened San Diego Mesa Mint or Howell Pogogyne, is a tiny and very aromatic wildflower in the mint family (Lamiaceae) that only grows in a few remaining spots in San Diego County – namely, in vernal pools once they begin to dry up. It can usually be seen in bloom in May and June.