| Herbivores and the number of tree species in tropical forests DH Janzen The American Naturalist 104 (940), 501-528, 1970 | 6239 | 1970 |
| Ten species in one: DNA barcoding reveals cryptic species in the neotropical skipper butterfly Astraptes fulgerator PDN Hebert, EH Penton, JM Burns, DH Janzen, W Hallwachs Proceedings of the National Academy of Sciences 101 (41), 14812-14817, 2004 | 4506 | 2004 |
| Seed predation by animals DH Janzen Annual review of ecology and systematics, 465-492, 1971 | 2747 | 1971 |
| Use of DNA barcodes to identify flowering plants WJ Kress, KJ Wurdack, EA Zimmer, LA Weigt, DH Janzen Proceedings of the National Academy of Sciences 102 (23), 8369-8374, 2005 | 2690 | 2005 |
| Why mountain passes are higher in the tropics DH Janzen The American Naturalist 101 (919), 233-249, 1967 | 2245 | 1967 |
| A DNA barcode for land plants CBOL Plant Working Group Proceedings of the National academy of Sciences of the United States of …, 2009 | 2117 | 2009 |
| DNA barcodes distinguish species of tropical Lepidoptera M Hajibabaei, DH Janzen, JM Burns, W Hallwachs, PDN Hebert Proceedings of the National Academy of Sciences 103 (4), 968-971, 2006 | 1913 | 2006 |
| Strategies in herbivory by mammals: the role of plant secondary compounds WJ Freeland, DH Janzen The American Naturalist 108 (961), 269-289, 1974 | 1814 | 1974 |
| When is it coevolution? DH Janzen | 1459 | 1980 |
| Tropical dry forests DH Janzen Biodiversity 15, 130-137, 1988 | 1433 | 1988 |
| Averting biodiversity collapse in tropical forest protected areas WF Laurance, D Carolina Useche, J Rendeiro, M Kalka, CJA Bradshaw, ... Nature 489 (7415), 290-294, 2012 | 1385 | 2012 |
| Coevolution of mutualism between ants and acacias in Central America DH Janzen Evolution, 249-275, 1966 | 1345 | 1966 |
| Why bamboos wait so long to flower DH Janzen Annual Review of Ecology and systematics, 347-391, 1976 | 1275 | 1976 |
| Tropical blackwater rivers, animals, and mast fruiting by the Dipterocarpaceae DH Janzen Biotropica, 69-103, 1974 | 1178 | 1974 |
| Neotropical anachronisms: the fruits the gomphotheres ate DH Janzen, PS Martin Science 215 (4528), 19-27, 1982 | 1131 | 1982 |
| How to be a fig DH Janzen Annual review of ecology and systematics 10, 13-51, 1979 | 1101 | 1979 |
| Euglossine bees as long-distance pollinators of tropical plants DH Janzen Science 171 (3967), 203-205, 1971 | 1011 | 1971 |
| Costa Rican natural history: with 174 contributors DH Janzen University of Chicago Press, 2018 | 1006 | 2018 |
| Seed-eaters versus seed size, number, toxicity and dispersal DH Janzen Evolution, 1-27, 1969 | 935 | 1969 |
| Synchronization of sexual reproduction of trees within the dry season in Central America DH Janzen Evolution, 620-637, 1967 | 912 | 1967 |
