Most are Cucurbita pepo or Cucurbita mixta. The giant pumpkin is Cucurbita maxima. Some are cultivars of Cucurbita moschata (butternut squash).
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this is what I found: Cucurbita maxima
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cucurbita pepo
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The scientific name for pumpkin is Cucurbita pepo.
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The scientific name for pumpkin is Cucurbita pepo. Pumpkins are a type of squash and belong to the gourd family, Cucurbitaceae. There are various cultivars and varieties of pumpkins, but they all fall under the broader classification of Cucurbita pepo.