On and after , plant material exchanges may be made with botanic gardens, institutions, municipal parks, and gardens.
Structure US Code
CHAPTER 30— OPERATION AND MAINTENANCE OF CAPITOL COMPLEX
SUBCHAPTER VI— BOTANIC GARDEN AND NATIONAL GARDEN
§ 2141. Supervision of Botanic Garden
§ 2142. Superintendent of Botanic Garden and greenhouses
§ 2144. Disbursement of appropriations for Botanic Garden
§ 2145. Restriction on use of appropriation for Botanic Garden