PaleoDB taxon number: 55293
Full reference: L. J. Hickey. 1977. Stratigraphy and paleobotany of the Golden Valley Formation (Early Tertiary) of western North Dakota. The Geological Society of America Memoir 150:1-183
Sister taxon: Betula stevensonii
Type specimen: USNM 43180. Its type locality is White Butte (USNM 14048), which is in a Wasatchian channel siltstone in the Golden Valley Formation of North Dakota.