name rousei is in recognition Glenn Rouse, who supplied Wolfe and Tanai with Eocene fossils of Acer from British Columbia. A. stewarti is the only species assigned to the extinct section Rousea and is designated the type species for the section. Description The samaras of A. rousei have two indistinct flanges medially along the notably inflated nutlet. The overall shape of the nutlet is circular to elliptic with the average length of the samara up to and a wing width of . The paired samaras of the species have a notably high attachment angle of 80° to 90°. While very similar in morphology to species in the modern section Palmata, A. rousei differs in the presence of the flanges on the nutlet and circular to elliptic outline of the nutlet. The wing venation of A. rousei is similar to the modern species A. spicatum and its closely related species. The similarities indicate A. rousei as a possible ancestor to the members of the section Palmata. References rousei Prehistoric angiosperms Plants described in 1987 Fossil taxa described in 1987 Eocene plants Extinct flora of North America Allenby Formation