Well kiddo, when we talk about plants, we usually call them by their common name like "sunflower" or "rose". But sometimes, scientists want to be very specific about which type of plant they are talking about, so they give it a special name called an epithet.
Think of it like a last name for the plant! Just like how you have a first name and a last name, plants have a common name and an epithet.
Let's take the sunflower as an example. Its scientific name is Helianthus annuus. "Helianthus" is the genus name, which is a group of plants that are closely related to each other. "Annuus" is the plant's epithet, which means "annual" in Latin, because sunflowers usually only live for one year.
So next time someone talks about a plant's epithet, remember that it's just a special last name that helps us identify and describe that particular plant!