As a rule, cultivated vines are monoecious (male and female flowers on the same plant), whereas wild vines are dioecious (separate on different plants). The cultivated monoecious vine has hermaphrodite flowers, i.e. the male and female sexual organs are united in one flower. The purely female wild vines have played an important role in the development of grape varieties.

The picture on the left shows a closed vine flower, the picture in the middle shows the shedding of the cap before pollination and the picture on the right shows the flower bud in full bloom shortly before pollination or fertilisation. 1 = five-lobed corolla (cap), 2 = stigma, 3 = anther, 4 = stamen, 5 = pistil, 6 = ovary, 7 = nectaries (honey glands), 8 = calyx.
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Roman Horvath MW
Domäne Wachau (Wachau)