Secretary
(h) The term “Secretary” means, except as otherwise provided in this chapter, the Secretary of the Interior or the Secretary of Commerce, as program responsibilities are vested pursuant to the provisions of Reorganization Plan Numbered 4 of 1970 ( 84 Stat. 2090 ); except that with respect to the provisions of this chapter which pertain to the importation or exportation of plants, the term also means the Secretary of Agriculture.