Astronium truncatum

Oligocene

Muddy River Formation

Beaverhead County, MT USA.

Showy 18mm flower on 67mm slab.  First we have seen from this location.

Plant.

Astronium is a plant genus in the Family Anacardiaceae which includes a variety of modern trees such as mango, cashew, pistachio, and pepper as well as poison ivy and poison oak.  Fossil flowers referred to Astronium date back to at least the Early Eocene.