California Code, Probate Code - PROB § 2031

(a) “California tribe” means an Indian tribe with jurisdiction that has tribal land located in California.

(b) “Indian tribe with jurisdiction” means a federally recognized Indian tribe that has a court system that exercises jurisdiction over proceedings that are substantially equivalent to conservatorship proceedings.

(c) “Tribal land” means land that is, with respect to a specific Indian tribe and the members of that tribe, “Indian country” as defined in Section 1151 of Title 18 of the United States Code.