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References Ambrose J.D. 2002. Update COSEWIC Status Report on the Common Hoptree Ptelea trifoliata in Canada, Ottawa, Committee on the Status of Endangered Wildlife in Canada, 14 p. ISBN 0-662-34314-X. Ambrose J.D., Kevan P.G., Gadawski R.M. 1985. Hop tree (Ptelea trifoliata) in Canada: population and reproductive biology of a rare species. Canadian Journal of Botany, 63: 1928-1935. Bailey V.L. 1960. Historical review of Ptelea trifoliata in Botanical and Medical Literature. Economic Botany, 14: 180-188. Bailey V.L., Herlin S.B., Bailey H.E. 1970. Ptelea