Monrovia Canyon Park - Purple Nightshade

(Solanum xanti)

Also known as Chaparral or San Diego Nightshade, this member of the Nightshade Family (Solanaceae) can be found in the park along the upper Bill Cull Trail. The distinctive pentagon-shaped purple flower, with the yellow center, can bloom throughout the year. It produces 3/8 inch green berries that remain green when ripe. Both the leaves and the fruit of this plant are VERY poisonous.
Click here for an excellent aricle about edible vs inedible nightshade.