Cornus swingii Manchester,
Xiang, Kodrul and Akhmetiev, Holotype from Horse Creek, Montana,
UF 18969-38375. Detail of leaf impression surface with well-preserved
outlines of the diagnostic compass-needle trichomes. Manchester,
S.R., Q. Xiang, T. M. Kodrul and M. A. Akhmetiev. 2009. Leaves
of Cornus (Cornaceae) from the Paleocene of North America
and Asia Confirmed by Trichome Characters. International Journal
of Plant Sciences, 170 (1): 132–142. Fig. 2J.