(Morus rubra L.) Red Mulberry is native to central and eastern North America, we're lucky it's made its way this far west. I've found several here in my local Southern California wild areas that have taken root and are regularly bearing fruit. 

(Rhamnus Crocea) The Spiny Redberry bush bears fruit mid Spring and is a staple food source for many of the local wildlife.The berries taste like a cross between cherry and cinnamon but don't have much flesh to offer, they are quite seedy, sometimes containing up to 4 seeds per berry.

(Heteromeles arbutifolia) grows these red "berries" we see here. Although they are SOUR when they are freshly picked they're quite tasty after being dried, it tastes a bit like a low sugar fruit rollup. They were historically eaten dried, ground down to a powder and used to flavor meals or mixed with water to make a refreshing drink.

(Quercus berberidifolia) The acorn is a staple food source for many tribes. With proper processing they can be used to make flour and made into "cakes" or added to other meals or stews. They are plentiful from September to December here in Southern California.

(Claytonia perfoliata) Commonly known as miner's lettuce is a flowering plant with fleshy edible leaves. It is packed with Vitamin C, can be eaten raw, used in salads or even boiled and eaten like spinach. 

High in vitamin C the berries of the Aromatic Sumac or Fragrant Sumac, can be eaten raw but are extremely tart. They were traditionally dried and powdered to flavor food or mixed with water to make a beverage similar to lemonade.