Variety:

Taxonomic group below the species.

Vasoconstrictor:

A substance that reduces the size of blood vessels.

Vasodilator:

A substance that increases the caliber of blood vessels.

Vegetative period:

Growing from seed, flowering, fertilization and seed production.

Venotonic:

A substance that restores the normal condition of the veins, in terms of tension and force is concerned.

Vesicant:

That produces blisters.

Vitamins:

Set of substances chemically unrelated to each other, but have the characteristic of being necessary for the proper functioning of the body and must be ingested through food.

Vulnerary:

A substance that heals wounds and injuries.