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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). 

Kirkpatrick, Kurt J.; Wilson, Hugh D. (1988). "Interspecific Gene Flow in Cucurbita: C. texana vs. C. pepo". American Journal of Botany (Botanical Society of America) 75 (4): 519–527. JSTOR 244421

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.

Andres, Thomas C. (1987). "Cucurbita fraterna, the Closest Wild Relative and Progenitor of C. pepo". Cucurbit Genetics Cooperative Report (Raleigh, NC: North Carolina State University) 10: 69–71.

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.

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