|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 et al. 1993||Stamen three-lobed, bearing four apparently bisporangiate thecae-two on the central lobe and one on each lateral lobe; thecae of central lobe attached at the base of the free portion of the lobe, theca of each lateral lobe centered at the point of fusion of the three lobes; sterile apex of lobes same length as thecae or longer, acute; pollen apertures elongate/elliptical.|