What is a nature oriented yet non-traditional name for a girl?

The father's name is Matthew Taylor and the mother's name is Brittainy Cheyenne. We're pretty set on the Middle name Sioux (SOO or SUE). We are leaning towards names that end in lee or ee such as Natalie, Bethany, Emma Leigh, etc. What would be some nature yet non-traditional names for a girl due in September '11? I don't prefer names like Willow, Stormy, or any names like those.