Detailed morphological and molecular studies have shown that the group is not actually monophyletic, with proposed floral homologies of the gnetophytes and the angiosperms having evolved in parallel. This makes it easier to reconcile molecular clock data that suggests that the angiosperms diverged from the gymnosperms around 300 million years ago.
Some more recent studies have used the word anthophyte to describe a group which includes the angiosperms and a variety of fossils (glossopterids, Pentoxylon, Bennettitales, and Caytonia), but not the Gnetales.
Phylogeny of anthophytes and gymnosperms based on Crepet et al. (2000)
^Doyle, J. A.; Donoghue, M. J. (1986). "SEED PLANT PHYLOGENY AND THE ORIGIN OF ANGIOSPERMS - AN EXPERIMENTAL CLADISTIC APPROACH". Botanical Review. 52 (4): 321–431. 10.1007/bf02861082.