Cylindropuntia acanthocarpa var. thornberi (Thorber & Bonker) Backeb.
Cactaceae
Wendy C. Hodgson
19845
2005-04-22
D. Damrel, S. & J. Williams
USA, Arizona, Yavapai County, Agua Fria National Monument, on the east side of the Agua Fria River, northeast (across the river) from Coldwater Guestranch.
Cholla cactus, branched -- flower measurements given in mm: 43w x 60l; outer tepals dark yellow with red stripe and beyond; inner tepals dark yellow with slightly red stripe; filaments dark red-maroon.