Ticodendron incognitum is the only species of Ticodendron, and the only member of the family Ticodendraceae. It is most closely related to the family Betulaceae.
Fossil record
†Ferrignocarpus bivalvisfossil fruits, from the Middle Eocene of Oregon and the Early EoceneLondon Clay flora of southern England, correspond closely in morphology and anatomy to fruits of extant Ticodendron. ==References==