Url,Type,Title,Publisher Place,Publisher,Date,Authors,Volume,Language,Pages https://www.biodiversitylibrary.org/page/61965222,Book,"Comparative external pollen ultrastructure of the Araceae and putatively related taxa ",[Saint Louis],Missouri Botanical Garden,1992,"Grayum, Michael Howard, 1949 -",[series v. 43],English,Page 117