California Code, Revenue and Taxation Code - RTC § 431

(a) “Timber” means trees of any species maintained for eventual harvest for forest products purposes, whether planted or of natural growth, standing or down, on privately or publicly owned lands, including Christmas trees, but does not mean nursery stock.

(b) “Timberland” means land zoned pursuant to Chapter 6.7 (commencing with Section 51100) of Part 1 of Division 1 of Title 5 of the Government Code.

(c) “Timber Advisory Committee” means a standing committee appointed by the board composed of one representative of the Board of Equalization, one representative of the State Board of Forestry and Fire Protection, five assessors from the rate adjustment counties defined in Section 38105, and one member representing small-scale timber owners, and one member representing large-scale timber owners.