Sparganium antiquum
Flower
Early Paleocene
Fort Union Formation
Glendive, Montana, USA

32mm floral head on 70mm slab.

Sparganium is a plant genus that belongs to the Order Poales, a group of flowering plants that includes ancient and modern aquatic plants and grasses.

The sediments of the Fort Union Formation were deposited right after the K/T mass extinction and have been the subject of numerous studies comparing faunas and floras before and after the event.