Here is a small list of examples of the laws in California that define misdemeanor charges.
Driving on a Suspended License – VC 14601.1(a)
DUI – VC 23152(a)
Public Drunkenness – 647(f)
Domestic Violence – PC 273.5
Reckless Driving – VC 23103 (b)
Disorderly Conduct – PC 415
Petty Theft – PC 484 or PC 488
Shoplifting – PC 459.5
Soliciting Prostitution – PC 647(b)
Probation Violations – PC 273.5
You can find a full explanation of the charges and their designation as either a felony or a misdemeanor, in the California Penal Code.