United States, Arizona, Coconino, Grand Canyon National Park; Tanner Trail near Colorado River. NPS-NVMP plot 03019. North-facing 30 deg., red shale slope west of trail overlooking rapids.
36.08956 -111.83211 +-5m. NAD83
T31N R5E S2 W 1/2; UTM: 3994203N 425088E 12S
1080 meters
3550ft.
Ephedra torreyana shrubland with Encelia resinifera, Atriplex canescens, and Dasyochloa pulchella.