The Peninsula of Yucatan : medical, biological, meteorological and sociological studies - Bequaert, Joseph Charles 1886-1982 (Carnegie Institution of Washington, 1933)
"Chapter XXVII-Botanical notes from Yucatan"--"Reprinted from Publication No. 431 of the Carnegie Institution of Washington, pages 505 to 524 two maps, Issued June 29, 1933"