The flower bud of the cultivated grapevine is a hermaphrodite flower, i.e. it contains the male and female sexual organs united in a single flower bud, which makes fertilisation much easier than in unisexual plants. The male sexual organs are the pollen-producing stamens (stamina), which consist of the stalk-shaped filament and the yellowish anthers at the tip. The entirety of all the stamens of a flower is called the androeceum. An anther contains four pollen sacs in which the pollen grains are formed with the haploid (n=19) male gametes (fertilising hormones). In the vine flower, five of these free-standing stamens surround the female sexual organ, the ovary, in a circle. This consists of two fused carpels, which contain two compartments with ovules inside. For this reason, the grapevine is an opaque flowering plant.
The ovary merges at its tip into the style, which ends in the stigma. The disc-shaped stigma is a spongy tissue that...
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