Summary
Crosses were made between Pelargonium zonale, P.inquinans, P.scandans and P. stenopetalum and any interspecific hybrids obtained were selfed. The species were also selfed. Pelargonium stenopetalum was self-incompatible and cross-incompatible as the pistillate parent with the other species. As the staminate parent, P.stenopetalum was also relatively unsuccessful in interspecific crosses. Crosses between P.zonale and P.inquinans produced relatively high numbers of viable seeds and the hybrids were quite self-fertile. As indicated by the ease of crossability and hybrid self-fertility, reproductive barriers were strong between P.scandens and the other species.
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References
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Harney, P.M., Chow, T.W. Crossability between some Pelargonium species. Euphytica 20, 286–291 (1971). https://doi.org/10.1007/BF00056089
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DOI: https://doi.org/10.1007/BF00056089