R. raphanistrum subsp. sativus
A radish is an edible root vegetable of the Brassicaceae family. People eat radishes all over the world. It was first grown in Europe in pre-Roman Empire|Roman times. Radishes are usually eaten as a crunchy salad vegetable. There are many variety (botany)|varieties of radishes. Some radishes are different in size, flavor, color and the length of time they take to grow.
It has a somewhat hot taste, rather peppery. This keeps some herbivores away, or limits the amount they eat. It acts as a defence against herbivory.