* It is also far from obvious that the first group is a clade, many
sources reckoning it as a paraphyletic group. Judd et al (1 edn, start
of chapter 8) give 6 alternative cladograms, in none of which are the
"primitive" dicots a clade.

Tree of Life

http://tolweb.org/tree?group=Angiosp...=Spermatopsida

has yet another cladogram which has three basal lineages (Amborellales,
Nymphaeales and Austrobaileyales), and a pentachotomy in the
Euangiosperms. (It does have most of the primitive euangiosperms in a
tetrachotomous magnoliid clade.)

+ + +
The second edition of Judd &al also assumes the three basal lineages, a
magnoliid complex, monocots and eudicots. It leaves some loose ends in
Chloranthaceae and Ceratophyllales
PvR