Oregon Revised Statutes Occupations and Professions § 671.379

(1) A registered landscape architect shall obtain a stamp of a design authorized by the State Landscape Architect Board. The stamp must bear the name, registration date and registration certificate number of the landscape architect and the legend “registered landscape architect.”

(2) A registered landscape architect shall stamp and sign all final drafts of professional documents that the landscape architect issues for obtaining permits, obtaining approvals by agencies other than the board or fulfilling contractual obligations, including maps, plans, designs, contract documents and reports.

(3) The signature and stamp of a registered landscape architect constitute certification that the document was prepared by the landscape architect or under the supervision and control of the landscape architect.