Your Charisma increases by 2 and your can increase any other ability score by 1.

As Dryads are fey beings bound to trees as long as they keep themselves healthy they will maintain their physical appearance and can continue to live for thousands of years. When unhealthy dryads start loosing the saturation in their skin and their leaves tend to wilt away shortly after, most of the time dryads in unhealthy condition can only last one or two years more at best.

As a Dryad you are quite tall standing at 6 - 8ft tall. Your size is medium.

Your speed is 30ft.

Over the years you have become accustomed to the dark nights the forest has to offer. You have dark vision, You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern colour in darkness, only shades of grey.

You can communicate with plants and most forest animals will not be aggressive to you. However plants are not too intelligent and can only respond to simple questions, and the animals will be aggressive towards you if provoked.

Due to having been a Fey you have advantage on saving throws against being charmed, and magic can't put you to sleep. 

You don’t need to sleep. Instead, they meditate deeply, remaining semiconscious, for 4 hours a day. (The Common word for such meditation is “trance.”) While meditating, you can dream after a fashion; such dreams are actually mental exercises that have become reflexive through years of practice. After resting in this way, you gain the same benefit that a human does from 8 hours of sleep.

When not wearing armour you get the effect of barkskin since you have bark for skin.

As your entire body is made up of highly flammable material fire now does 1D6 extra damage to you.

You can speak, read, and write Common and Sylvan.