Mentions of rare plants in this PDF:
...rhombifolia), California black walnut (Juglans californica), Fremont’s cottonwood (Populus fremontii),...
...rabbit-tobacco (Pseudognaphalium leucocephalum), and broadleaf pondweed (Stuckenia striata)....
...bush lupine (Lupinus arboreus) and mock heather (Ericameria ericoides). The southern California legless...