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.
The locations of 17 sites (black points) where extant field samples of leaf materials of Quercus guyavifolia were collected and two sites (purple stars) where fossil materials of Q. preguyavaefolia were collected. (A) The study area. (B) Locations where extant and fossil leaf materials were collected. (C) Detailed location map showing 16 of the 17 collection sites in the boundary (grey line) region between Yunnan and Sichuan Provinces.
