Gnetal

It^([the publicised book]) provides a complete coverage of the evolutionary approach to the major plant groups and discusses such special subjects as details on water ferns, gnetals, cyiads,^([sic]) the principal fungous groups, and slime molds.

As we already have had occasion to remark for the gnetal and casuarinal alliances, a ½ floral symmetry is evidently an ancient one for that phylum.