Polygonocarpum curtisii, Manchester & O'Leary, 2010

Manchester, Steven R., 2014, Revisions To Roland Brown’S North American Paleocene Flora, Acta Musei Nationalis Pragae Series B 70 (3 - 4), pp. 153-210 : 177

Polygonocarpum curtisii MANCHESTER et O’LEARY

A winged fruit of Polygonocarpum curtisii fruit was figured as Ulmus rhamnifolia WARD by Brown (1962, pl. 24, fig. 17) this fruit type was compared informally with Wimmeria by Crane et al. (1990). The fruits are are pedicellate, wide-elliptical with an emarginate base and apex, 9–10 mm high and 12–14 mm wide, with three radially arranged longitudinal wings diverging from a central fusiform, single-seeded endocarp. Several longitudinal veins run the full length of the fruit body. The wings are chartaceous, with a dense anastomosing network of fine venation but lacking marginal veins ( Manchester and O’Leary 2010).