Prop 19 completely legalize possession, but would prevent ALL private growing and require the possessor to prove they purchased from a legal grower (and thus paid the tax) on the spot.
Growing your own or not carrying the tax stamp would result in even stiffer criminal penalties than current law.
City of Stockton measure I is designed to get Stockton in on the ground floor of this brilliant "Tax the Dopers" scheme.
I believe you are misinformed. Taxation would be left up to local governments if they choose to license sales, and it would be legal to grow your own on a 5'x5' area on your property.
What is the source for your claims?