Saturday, Steve and I took a drive up Highway 180 towards the Nature Conservancy's Gila Riparian Preserve. (The Gila River in New Mexico is one of the last free-flowing rivers in the Southwest.) It was a beautiful day and we had a nice walk along the river and in the Preserve.
The photo above is of the Gila River as it flows through the Preserve. Below is a shot of a Cottonwood root. Cottonwoods are phreatophyts (they have a tap root which reaches to the water table), and they grow in profusion along the Gila River.