Manchester and Pigg published the 2008 type description for D. cachensis in the journal Botany, Volume 86, number 9.

The specific name is a reference to Cache Creek, British Columbia, the nearest town to the McAbee site.

The infructescences are pedunculate having a globose head which bore at least twelve flowers and has been preserved as fossils with several sessile fruits.

Dillhoffia was most likely a non-magnoliid angiosperm as indicated by its inferior ovary, but placement into a specific family is not possible with the fossils known.

[1] A somewhat similar flower was described from the Warman clay pit in western Tennessee, but it is smaller and the shape of the veins is different.