My, this is fun. :D

Name: Timber [Teresa Calhoun]
Power: Manipulation of plantlife - that manipulation is limited by the amount of water and natural ground (soil, sand, even rock) nearby. She can't make something grow straight out of concrete, for example, unless some organic ground is running through or underneath it. If you let her near a water main, however, she can really screw over a city street. Besides the ability to make plantlife grow, she can also manipulate it once it is grown - wrapping vines around something, as another example.
Backstory: From the midwest US, Timber lived on a family farm and continuously won blue ribbons in the county fair for the best vegetables - she had no idea that she was a mutant until Professor Xavier recruited her. She lives at the Xavier Mansion, and helps teach when they're low on staff. She has a garden in the back of the house, where she tends rare plants that have medicinal properties. She also researches these plants in association with other mutants, should an ailment suffered by a specific mutant require a different remedy than tradition calls for. Timber takes night courses to get her doctorate in botany.

(Her specific power is why that stylized flower on her vest is there - it's a flower, but also an X. ooh, I know I'm clever.)