"Stewart Robert Hinsley" schreef
Pentapetaceae presumably equals Dombeyoideae and Sparrmanniaceae
Grewioideae. Durionaceae presumably means that they've chopped the
Kubitzki and Bayer Helicteroideae into 2?

That would seem to leave Bombacaceae paraphyletic.

***
I wouldn't be surprised. The book is something of a compromise between
the latest phylogenetic information and traditional circumscriptions.

BTW The Malvaceae s.l. treatments apparently have been contributed
by Martin R Cheek