Any terrestrial plant which is to be imported by mail and which may be imported under 50 CFR part 17 or part 23 only if accompanied by documentation, shall be mailed to Plant Protection and Quarantine (at a port authorized for such purpose by the U.S. Department of the Interior in 50 CFR part 24 pursuant to section 9(f) of the Act (16 U.S.C. 1538 (f))); and shall be accompanied by a separate sheet of paper within the package plainly and correctly bearing the name, address, and telephone number of the intended recipient in the United States; and shall plainly and correctly bear on the outer container the following information:

Genus and species, and quantity of each (if a hybrid, genus of each parent, and quantity of each hybrid),

Country and locality where collected from the wild or where produced from cultivated stock,

Name and address of shipper, owner, or person shipping or forwarding the plants, and

Serial number and type (e.g. permit, certificate) of document issued for the importation of the plant.

Any terrestrial plant which is to be exported or reexported by mail and which may be exported or reexported under 50 CFR part 17 or part 23 only if accompanied by documentation, shall be mailed to Plant Protection and Quarantine (at a port authorized for such purpose by the U.S. Department of the Interior in 50 CFR part 24 pursuant to section 9(f) of the Act (16 U.S.C. 1538(f))); shall be wrapped in double wrapping, with an unsealed inner wrapping addressed to the foreign recipient and bearing sufficient postage for mailing to the foreign destination; shall be accompanied by a separate sheet of paper within the package plainly and correctly bearing the following information:

Genus and species, and quantity of each (if a hybrid, genus of each parent, and quantity of each hybrid),

Country and locality where collected from the wild or where produced from cultivated stock,

Name and address in the United States of shipper, owner, or person shipping or forwarding the plants, and

Serial number and type (e.g. permit, certificate) of document issued for the exportation or reexportation of the plant.