Squashes generally refer to four species of the genus Cucurbita, also called marrows depending on variety or the nationality of the speaker. These species include C. maxima (hubbard squash, buttercup squash, some varieties of prize pumpkins, such as Big Max), C. mixta (cushaw squash), C. moschata (butternut squash), and C. pepo (most pumpkins, acorn squash, summer squash, zucchini). In North America, squash is loosely grouped into summer squash or winter squash, depending on whether they are harvested as immature fruit (summer squash) or mature fruit (autumn squash or winter squash). Gourds are from the same family as squashes. Well known types of squash include the pumpkin and zucchini. Giant squash are derived from Cucurbita maxima and are routinely grown to weights nearing those of giant pumpkins. For more details, refer to list of gourds and squashes.