P. axillaris has three subspecies: P. a. axillaris, P. a. parodii, and P. a. subandina. P. a. axillaris and P. a. parodii are found in the flat parts of the Pampas, while P. a. subandina is found in the highlands near the Andes.[4]
^Kokubun H, Nakano M, Tsukamoto T, Watanabe H, Hashimoto G, Marchesi E, Bullrich L, Basualdo IL, Kao T, Ando T (September 2006). "Distribution of self-compatible and self-incompatible populations of Petunia axillaris (Solanaceae) outside Uruguay". Journal of Plant Research. 119 (5): 419–30. doi:10.1007/s10265-006-0002-y. PMID16915365. S2CID21122112.
^ abTurchetto C, Fagundes NJ, Segatto AL, Kuhlemeier C, Solís Neffa G, Speranza PR, Bonatto SL, Freitas LB (February 2014). "Diversification in the South American Pampas: the genetic and morphological variation of the widespread Petunia axillaris complex (Solanaceae)". Molecular Ecology. 23 (2): 374–89. doi:10.1111/mec.12632. PMID24372681. S2CID13847331.
^USDA, Agricultural Research Service, National Plant Germplasm System. "Petunia x atkinsiana". US National Plant Germplasm System.{{cite web}}: CS1 maint: multiple names: authors list (link)
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