↑ Brickell, CD; Alexander, C.; David, JC; Hetterscheid, WLA; Leslie, AC; Malecot, V.; Jin, X.; Cubey, JJ (2009), International Code of Nomenclature for Cultivated Plants (ICNCP or Cultivated Plant Code) incorporating the Rules and Recommendations for naming plants in cultivation, Eighth Edition, Adopted by the International Union of Biological Sciences International Commission for the Nomenclature of Cultivated Plants (PDF) , International Association for Plant Taxonomy and International Society for Horticultural Science
↑Stearn, William T. (May 1962). "The Origin of the Male and Female Symbols of Biology". Taxon. 11 (4): 111. doi:10.2307/1217734. JSTOR1217734. S2CID87030547. Later, in his Mantissa Plantarum (1767) and Mantissa Plantarum altera (1771), Linnaeus regularly used ♂, ♀ and ☿ for male, female and hermaphrodite flowers respectively. Their aptness made them easy to remember and their convenience led to their general acceptance in zoology as well as botany. Koelreuter found them especially convenient when recording his experiments in hybridization; as late as 1778 he used the sign to denote a hybrid plant. No evidence of the use of these signs for this purpose before Linnaeus's time has been found.
References
Turland, N. J.; etal. (Wiersema, J. H., Barrie, F. R., Greuter, W., Hawksworth, D. L., Herendeen, P. S., Knapp, S., Kusber, W.-H., Li, D.-Z., Marhold, K., May, T. W., McNeill, J., Monro, A. M., Prado, J., Price, M. J. & Smith, G. F.) (2018). International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Vol.Regnum Vegetabile 159. Glashütten: Koeltz Botanical Books. doi:10.12705/Code.2018. ISBN978-3-87429-425-6.{{cite book}}: CS1 maint: publisher location (link)
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