The leaflets of Cucurbita mollissima are 5-11, from oblong to obovate oblong, the apex is acuminate, the base is wedge-shaped, there is no hair on the top, the back and petiole are hairy, and the leaflets in the middle are about 13-24cm long. The width is about 4.5-8 cm, the lateral leaflets gradually become smaller, the back of which are all raised, and the leaf surface has fine reticular veins.
The flower is solitary in the axil of the top leaf of the branch, the pedicel is relatively thick, the calyx is cup-shaped, the petal color is light yellow green, it is narrow lanceolate to linear, the upper part is reversed, the anther is narrow linear, the style color is dark red. The flowering period is from May to November.
Melon chestnut is a capsule, nearly pear shaped, yellow brown in color, woody, with a thick pericarp, no hair on the outside, and dense and long soft hair on the inside.
