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Nina Hobbhahn, Steven D. Johnson, Benny Bytebier, Edward C. Yeung, Lawrence D. Harder, The evolution of floral nectaries in Disa (Orchidaceae: Disinae): recapitulation or diversifying innovation? Annals of Botany. ,vol. 112, pp. 1303- 1319 ,(2013) , 10.1093/AOB/MCT197

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Félix Forest, Peter Goldblatt, John C. Manning, David Baker, Jonathan F. Colville, Dion S. Devey, Sarah Jose, Maria Kaye, Sven Buerki, Pollinator shifts as triggers of speciation in painted petal irises (Lapeirousia: Iridaceae) Annals of Botany. ,vol. 113, pp. 357- 371 ,(2014) , 10.1093/AOB/MCT248

I. Kiepiel, S. D. Johnson, Shift from bird to butterfly pollination in Clivia (Amaryllidaceae) American Journal of Botany. ,vol. 101, pp. 190- 200 ,(2014) , 10.3732/AJB.1300363

Tia-Lynn Ashman, Megan Bradburn, Denise H. Cole, Bernard H. Blaney, Robert A. Raguso, THE SCENT OF A MALE: THE ROLE OF FLORAL VOLATILES IN POLLINATION OF A GENDER DIMORPHIC PLANT Ecology. ,vol. 86, pp. 2099- 2105 ,(2005) , 10.1890/04-1161

Timotheüs van der Niet, Steven D. Johnson, Phylogenetic evidence for pollinator-driven diversification of angiosperms Trends in Ecology & Evolution. ,vol. 27, pp. 353- 361 ,(2012) , 10.1016/J.TREE.2012.02.002