with a maximum width of . The lower edge of the wing is a smooth convex curve angling out from the basal sulcus up to the narrow rounded wing tip, while the upper edge of the wing is straight from nutlet to wing tip. Four to five veins branch from the proximal edge of the wing at 10° to 30° angles and from convex arcs along the wing, forking and frequently anastomising. References †cascadense Prehistoric angiosperms Plants described in 1987 Fossil taxa described in 1987 Miocene plants Extinct flora of North America Fossils of the United States