Dalechampia has unisexual flowers that are secondarily united into bisexual blossoms (pseudanthia), which act as the pollination units. The pollination and floral evolution of this genus have been studied more intensively than perhaps any other member of the euphorbia family. In the neotropics (Americas), most species are pollinated by resin-collecting female bees, including euglossine bees and Hypanthidium of the Megachilidae, which use resin in nest construction. About a dozen neotropical species (including D. spathulata, shown below) are pollinated by fragrance-collecting male euglossine bees, which use these fragrances to attract females for mating. There are at least three independent pollination shifts from pollination by female resin-collecting bees to pollination by male fragrance-collecting bees. African and Asian species are also pollinated by resin-collecting megachilid bees, but Malagasy species are pollinated by pollen-feeding beetles and pollen-collecting bees.
^Govaerts, R., Frodin, D.G. & Radcliffe-Smith, A. (2000). World Checklist and Bibliography of Euphorbiaceae (and Pandaceae) 1–4: 1–1622. The Board of Trustees of the Royal Botanic Gardens, Kew.
^Forzza, R. C. 2010. Lista de espécies Flora do Brasil "2010". Archived from the original on 2015-09-06. Retrieved 2015-08-20.. Jardim Botânico do Rio de Janeiro, Rio de Janeiro
^Martínez Gordillo, M., J. J. Ramírez, R. C. Durán, E. J. Arriaga, R. García, A. Cervantes & R. M. Hernández. 2002. Los géneros de la familia Euphorbiaceae en México. Anales del Instituto de Biología de la Universidad Nacional Autónoma de México, Botánica 73(2): 155–281.
^Nasir, E. & S. I. Ali (eds). 1980–2005. Flora of Pakistan University of Karachi, Karachi
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