A phytosanitary certificate is an official document issued by the plant protection authority of the exporting country. It certifies that the plants being exported, in this case, Plumeria, meet the phytosanitary requirements of the importing country, such as the US. The certificate confirms that the plants are free from pests and diseases of concern and have undergone the necessary inspections. A phytosanitary certificate is often required by the USDA for the importation of plants, and it helps ensure that imported Plumeria does not pose a risk to US agriculture and ecosystems.