Text-fig. 9e

M a t e r i a l. USNM PAL 622108, 622276, 622650.

L o c a l i t y. Disbrow Creek.

D e s c r i p t i o n. Winged fruit elongate-elliptical, with a central seed body; wing with pointed apex and base; fruit 25.1–32.12 mm long, 7.3–8.6 mm wide; seed body 4.9–6.4 mm long, 3.7–5.3 mm wide; ventral (intramarginal) vein of the wing prominent, marginal or submarginal; stylar vein present, minor vein small, mostly parallel, occasionally dichotomizing or anastomosing (more on dorsal side); seed bodies sub-circular.

R e m a r k s. Ailanthus fruits in North America have traditionally been placed into either Ailanthus americana COCKERELL or Ailanthus lesquereuxi COCKERELL but are morphologically identical to those described earlier as Ailanthus confucii UNGER (Corbett and Manchester 2004). The fossil matches the description of A. confucci by having a marginal to submarginal ventral vein as opposed to having an inset vein as in Ailanthus tardensis HABLY (Corbett and Manchester 2004). A. confucii is recognized from the early Eocene through late Miocene of western North America (Corbett and Manchester 2004). Among extant species, it resembles the temperate eastern Asian native species, Ailanthus altissima, which is invasive today in North America and Europe.