Kardiasperma

Extinct genus of flowering plants

Kardiasperma is an extinct genus of flowering plants in the hazelnut family, Betulaceae, containing the single species Kardiasperma parvum. The species is solely known from the middle Eocene sediments exposed in north central Oregon and was first described from a series of isolated fossil nuts in cherts.

This keyword could refer to multiple things. Here are some suggestions: