[2] Migration between the slightly older Russian Far East site and North America was likely facilitated by the Beringian land bridge during the early to middle Paleoene.

Range reduction was likely due to overall global cooling during the Oligocene and Miocene, combined with increased and intensified rain fall in the northern hemisphere and associated high latitude drying.

[7] Manchester (1999) figured a single Dipteronia mericarp fossil which was at that time identified as being from the Eocene Fushun Formation in Liaoning Province, China.

[8] Doubt was later raised regarding the provenance of the fossil, with Manchester being informed that the UCMP formerly housed collections of very similarly colored shale from the Chu Chua Formation near Joseph Creek, British Columbia.

[1] Palynological analysis of pollen in the specimen matrix was performed in October 2000 in conjunction with the Manchester (2001) research as an attempt to determine the origin site.

[1] Dipteronia brownii fruits were born in schizocarp consisting of three, and less commonly two, flat mericarps which attach along a straight proximal edge.