nettle leaf goosefootChenopodium murale
Chenopodium murale, a dicot, is an annual herb that is not native to California; it was introduced from elsewhere and naturalized in the wild. It’s bloom period is January-December. This plant has known uses according to Wikipedia.
additional informational links: Wikipedia , Calflora
click image for maximum resolution
*these pictures might be two different types of goosefoot, I’m not totally sure yet!