"Welcome to the River of Grass" by Jane Yolen

Beautifully written and illustrated book about the Florida Everglades.

Tree islands hump up over the grass, clump up into hummocky hammocks covered with vines; live oak, myrsine, pigeon plum -- making green clouds of trees crowding the horizon.
Farther south by the mangroves on stiltlike roots the water goes brackish, then brine.