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Debates about the origin of Cucurbito pepo have been going on since at least 1857 (Kirkpatrick and Wilson 1988). There have traditionally been two opposing theories about its origin: 1) that C. pepo is a direct descendant of C. pepo var. texana and 2) that C. pepo var. texana is feral C. pepo (Nee 1990). A more recent theory is that it is a descendant of C. fraterna and hybridized with C. texana (Andres 1987); resulting in two distinct domestication events in two different areas: one in Mexico and one in the eastern United States, with C. fraterna and C. texana, respectively, as the ancestral species (Andres 1987; Saade and Hernández; Sanjur et al. 2002; Soltis and Soltis 1987). Cucurbita pepo may have appeared in the Old World prior to moving from Mexico into South America (Saade and Hernández).
Nee, Michael (1990). "The Domestication of Cucurbita (Cucurbitaceae)". Economic Botany (New York: New York Botanical Gardens Press) 44 (3, Supplement: New Perspectives on the Origin and Evolution of New World Domesticated Plants): 56–68. doi:10.2307/4255271.
Saade, R. Lira; Hernández, S. Montes. "Cucurbits". Purdue Horticulture. Retrieved September 2, 2013.
Sanjur, Oris I.; Piperno, Dolores R.; Andres, Thomas C.; Wessel-Beaver, Linda (2002). "Phylogenetic Relationships among Domesticated and Wild Species of Cucurbita (Cucurbitaceae) Inferred from a Mitochondrial Gene: Implications for Crop Plant Evolution and Areas of Origin" (PDF). Proceedings of the National Academy of Sciences of the United States of America (Washington, DC: National Academy of Sciences) 99 (1): 535–540. doi:10.1073/pnas.012577299.
Soltis, Douglas E.; Soltis, Pamela S. 1987. Isozymes in Plant Biology. London: Dioscorodes Press. p. 176. ISBN 0-412-36500-6.
From Wikipedia 5 October 2014.