Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Kratom trees (Mitragyna speciosa) randomly collected from four regions of Thailand including north, northeast, central, and south with the description of average microclimate air variables in each region during a 30-year period (1991 – 2020) obtained from the Department of Meteorology.
