The flowers are yellow and solitary in the axes of leaves and are borne by yellow-greenish peduncles.
Each has a subcampanulated five-lobed corolla and a five-parted calyx.
They are monoecious, so the male (stamens) and the female reproductive parts (pistils and ovary) are borne in different flowers on the same plant.

The male flowers’ calyx is shorter than the corolla.
They have five stamens, four of which are coupled and one is single with monadelphous anther.
The female flowers have three staminoids and a three-carpel ovary.
The two sexes are distinguishable by observing the globular and hairy inferior ovary of the female flowers.
The flowers are yellow and solitary in the axes of leaves and are borne by yellow-greenish peduncles. Each has a subcampanulated five-lobed corolla and a five-parted calyx. They are monoecious, so the male (stamens) and the female reproductive parts (pistils and ovary) are borne in different flowers on the same plant.
The male flowers’ calyx is shorter than the corolla. They have five stamens, four of which are coupled and one is single with monadelphous anther. The female flowers have three staminoids and a three-carpel ovary. The two sexes are distinguishable by observing the globular and hairy inferior ovary of the female flowers.
Citrullus colocynthis