|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|P. S. Herendeen and D. L. Dilcher 1991||Fruits are 5.1-8.5 (estimated) cm long (x=7.2 cm), 1.5-2.5 cm wide, excluding wing (x=2.1), and bear a continuous vascularized wing along the placental suture that is 5-8 mm wide (x=6.1 mm, maximum width). The wing is often significantly wider at the fruit center than at the ends. The fruits are thin and membranous. The fruit base is acute to obtuse; the apex is obtuse to blunt and rounded or occasionally mucronate with a persistent style base (ca. 1 mm long). The fruits are short stipitate (ca. 2 mm) and bear few (approx. three) ovules. The fruit valve venation consists of numerous, closely spaced primary veins that arise from the placental and nonplacental sutures at 90 degrees angles. The veins divide and anastomose to form a fine reticulum. The wing venation consists primarily of a poorly organized looping pattern, although a longitudinal orientation occurs toward the apex in some specimens.|