Britannica
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How do the sepals and petals of many Cucurbitales flowers compare?
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Cucurbitales
Pumpkins and gourds, order Cucurbitales.
In many flowers within the Cucurbitales order, the sepals and petals are often not sharply different in appearance. While these floral parts are typically distinct in many other plant groups, species in this order frequently exhibit a lack of clear differentiation between the two.1
In the specific case of the Cucurbitaceae family—which comprises the majority of the order's genera—most species possess five sepals and five petals in each flower. These flowers are generally unisexual and are borne in the leaf axils.2