Traditionally, the cucurbit species Cucurbita maxima and Cucurbita moschata have been placed into two groups - pumpkinsand grammas respectively (Figure 1). In Australia popular description of these species has grouped both of them as pumpkins.
Figure 1. Pumpkin (a) and Butternut gramma (b)
Other members of the Cucurbitaceae family commonly grown in Australia include cucumber (Cucumis sativus), rockmelons (Cucumis melo), watermelons (Citrullus lanatus var. citroides), zucchini (Cucurbita pepo), squash (C. pepo), gourds (C. pepo and C. moschata), and the choko or chayote (Sechium edule). The Kabocha pumpkin is a cross between Cucurbita maxima and Cucurbita moschata.