Book: Field Columbian Museum
. Field Museum of Natural History . Publications of the Field Columbian Museum . 2008-06-23 . Botanical Series Volume 1 . 1902 . Field Columbian Museum . Contribution III to the Coastal and Plain Flora of Yucatan . https://books.google.com/books?id=2zoCAAAAYAAJ&pg=RA2-PA396 . 1892–1895 .