Official rules here. My idiosyncratic interpretation here. Camera problem remains unresolved, so for the time being I will have to link to other people's pictures of said plants. So without further ado:

1. Eschscholzia californica: California poppy.
Utterly prolific annual that self-seeds from seed pods that "pop" open and scatter seed hither and yon when dry. Started coming up in our yard in February; I kept expecting them to eventually fade away, but they keep on coming, even as I clear out the old growth. Official state flower, but not therefore (contrary to common assertion) afforded special legal protection.

2. Agapanthus [??]:Lily-of-the-Nile.
Exact species indeterminate; likely a hybrid. Native to southern Africa, not the Nile region. Ours are light purple; used widely in landscaping around here in shades from white to deep purple.

3. Meticago sativa: Alfalfa.
Purple-flowering plant that grows in clumps. GrandDad supposes it is left over from when this neighborhood was in agricultural use, 65+ years ago. Good source of nitrogen.